NBTExplorer is an open-source NBT editor for all common sources of NBT data. It's mainly intended for editing Minecraft game data.

NBTExplorer

A graphical NBT editor for all Minecraft NBT data sources

Viper is a launcher and updater for the Titanfall|2 mod Northstar, and not much more than that.Currently Viper is capable of:Updating/Installing NorthstarManaging ModsBeing pretty!

Viper

Viper is a launcher and updater for Northstar, and not much more than that.

In War Thunder, aircraft, attack helicopters, ground forces and naval ships collaborate in realistic competitive battles. You can choose from over 1,900 vehicles and an extensive variety of combat situations many of which are exclusive. You can find yourself blasting your pursuers from a bomber turret, defending your teammates on the ground from an air raid with anti-aircraft guns, shooting down enemy planes with a firestorm from multiple rocket launchers, or trying to sink an enemy warship with a torpedo from a fast attack boat.Features include:Cross-platform gameplay between Windows PC, Linux, Mac, PlayStation 4, Xbox One, PlayStation 5 and Xbox Series X|S users.Over 2,000 highly detailed aircraft, helicopters, tanks, warships and other combat vehicles crafted carefully from historical documents and surviving sources.Over 100 maps representing the main historical battle theaters.Intense PvP experiences in full-scale combat missions at various difficulty settings for all play styles and degrees of experience.Rich PvE content including dynamic historical campaigns and solo missions.Regular content updates including new vehicles, maps, missions and nations.Astonishing graphics, authentic sound effects and beautiful music creating an atmosphere to fully immerse yourself in.Create custom content for War Thunder and share it on War Thunder Live, with the prospect of earning real money through the Revenue Share Partner System!NOTE: This package is not verified by, affiliated with, or supported by Gaijin.NOTE: This installs the launcher into the user data directory. Expect storage usage of 14GB+Below is the steps to run this flatpak in a custom directoryOpen FlatsealSelect WarThunder on the leftScroll down to "Filesystem", "Other files"Add a new entry via the icon with a "folder" and "plus" signInput the path you want to let WarThunder run in. IE `/home/name/Games/WarThunder`Scroll down to "Environment", "Variables"Click the "plus" sign to add a new entryWrite down an enviroment variable, IE `CUSTOM_DIR=/home/name/Games/` (NOTICE: WarThunder is not included here)Run WarThunderNotice that WarThunder is now working using CUSTOM_DIRThis flatpak runs with gamescope to prevent xorg crashes.To modify gamescope args, use the following commands, filling in the arguments between the parenthesis"flatpak override --user net.gaijin.WarThunder --env=GAMESCOPE_ARGS=""

War Thunder

War Thunder is the most comprehensive free-to-play, cross-platform, MMO military game.

Twine is an open-source tool for telling interactive, nonlinear stories.You don't need to write any code to create a simple story with Twine, but you can extend your stories with variables, conditional logic, images, CSS, and JavaScript when you're ready.Twine publishes directly to HTML, so you can post your work nearly anywhere. Anything you create with it is completely free to use any way you like, including for commercial purposes.Twine was originally created by Chris Klimas in 2009 and is now maintained by a whole bunch of people at several different repositories.

Twine

Twine is an open-source tool for telling interactive, nonlinear stories.

OpenArena is a free and open source first-person shooter game based heavily on the Quake III Arena-style deathmatch. Score frags to win the game using a balanced set of weapons each designed for different situations. Guns include a chaingun, rocket launcher, shotgun, and railgun.OpenArena's style of play is very fast and requires skill to be played successfully online. Gameplay modes include Deathmatch, Team Deathmatch, Tournament, Capture the Flag, Elimination, CTF Elimination, Last Man Standing and Double Domination.

OpenArena

Free and open source first-person shooter

Augustus is an open source re-implementation of Caesar III with changes to gameplay.The aim of this project is to provide enhanced, customizable gameplay to Caesar 3 using project Julius UI enhancements.Support for widescreen resolutionsWindowed mode support for 32-bit desktopsSeveral small in-game quality of life improvementsZoom controlsRoadblocksMarket special ordersPartial warehouse storageIncreased game limitsAugustus requires the original assets (graphics, sounds, etc) from Caesar 3 to run. It optionally supports the high-quality MP3 files once provided on the Sierra website.

Augustus

Augustus is an open source re-implementation of Caesar III with changes to gameplay

ChessX is an Open Source chess database. With ChessX you can operate on your collection of chess games in many ways: browse, edit, add, organize, analyze, etc.Load and save PGN filesWork with multiple databases simultaneouslyBrowse games, including variationsEnter moves, variations, commentsPlay games in training mode or play out games against an engineSetup board, copy/paste FEN, merge gamesLint tools to catch performance, usability, version compatibility, and other problems.Display opening tree for current positionAnalyze using UCI and Winboard/Xboard Chess enginesObserve and play games on FICS

ChessX

Yamagi Quake II is an alternative client for id Software's Quake II. Our goal is to provide the best Quake II experience possible, we strive to preserve the gameplay as it was back in 1997. Thus we aim mostly for bug fixes, stability and gentle enhancements were appropriate. Yamagi Quake II has a lot of unique features. The most notables ones are:A modern OpenGL 3.2 renderer, providing a greatly enhanced look and feel. The original OpenGL 1.4 and even the Software renderers are still supported. Both 3D accelerated renderers support anisotropic filtering and multisampling anti aliasing.Full support for widescreen displays and arbitrary resolutions. The HUD can be scaled to be readable on high resolutions.Support for surround sound, from stereo up to 7.1 channels and even HRTF. The background music can be played from OGG/Vorbis files, a CD drive is no longer necessary.A rewritten savegame system. Yamagi Quake II savegames are completely reliable and backward compatible between releases as long as the principle architecture stays the same.Highly precise timings. For example, on a flat panel display with a 59.95 hertz refresh rate and vertical synchronisation (VSync) enabled Yamagi Quake II is running at exactly 59.95 frames per second.In comparison with the original client over 1.500 bugs were fixed. The Yamagi Quake II client is very well tested and stable. The dedicated server is able to run for weeks without a single restart. Last but not least the code is fully 64 bit clean and highly portable.Commercial data files are required to run the supported game. These can be aquired though a multitude of sources. See the manual for more info on this.

Yamagi Quake II

Yamagi Quake II is an alternative client for id Software's Quake II

Free Train Simulator for everyone - Licensed under GPL 3.0

Libre TrainSim

OpenArena is a free and open source first-person shooter game based heavily on the Quake III Arena-style deathmatch. Score frags to win the game using a balanced set of weapons each designed for different situations. Guns include a chaingun, rocket launcher, shotgun, and railgun.OpenArena's style of play is very fast and requires skill to be played successfully online. Gameplay modes include Deathmatch, Team Deathmatch, Tournament, Capture the Flag, Elimination, CTF Elimination, Last Man Standing and Double Domination.This version of OpenArena is based on the Quake3e engine by "Ec" on GitHub, I do not take credit for his work or any of the work done by the OpenArena team. This Flatpak was made to be a replacement of the original one released on 2012, as it contains bugs and annoyances not present in this engine. The gameplay is 100% compatible and if not, please make an issue in my repo(xplshn/openarena), I'll investigate it.

OpenArena (Quake3e)

Path of Building Community Fork - A powerful build planner for Path of Exile

This is a fork of Openarl's Path Of Building that includes many extra features not in the base version of PoB

Path of Building  (Community)

Path of Building (Community) - A powerful build planner for Path of Exile

A 2d side scrolling puzzle game where you guide large groups of little penguins through various obstacles and dangers using their numerous talents.A level editor is included to allow building your own levels and numerous user contributed levels are included as well.The game is heavily inspired by the classic Lemmings.

Pingus

Guide groups of penguins through various obstacles

A free/libre and open-source party game that is meant to replicate the feel of games such as Mario Party

Super Tux Party

Control a worm in its quest to eat bonuses and become longer. Outmaneuver enemy worms while eating doughnuts and ice cream to increase your length. Each worm has ten lives and loses one by running into a wall, another worm, or itself. The enemy worms are after the same bonuses that you are, so be careful: if they become too large, you won’t have much room for movement.The adventure progresses through 26 maps of increasing difficulty. The early levels are mostly open with a few walls, but later on, cramped spaces and teleporters make things more interesting.Play on your own against up to five enemy worms, or share your keyboard to play with a friend.

GNOME Nibbles

Each square piece has a number on each side. Position the pieces on the left side of the board so that the same numbers are next to each other. If the numbers don’t match, you can’t put the piece there. Move quickly: you’re being timed!You can make the game easier or harder by changing the size of the board.

GNOME Tetravex

Tux is just getting ready to go fishing when all of a sudden, he receives a message. The message states that his home, Icy Island, has been taken over by the Snow King, and a new Fish Tax will be imposed. Tux is furious! How dare the Snow King take away his fish?! Help Tux overthrow the Snow King and stop him from taking Tux's fish away!ReTux is a libre open source action platformer loosely inspired by the Mario games, utilizing the art assets from the SuperTux project. The name "ReTux" is a play on the words "redux" and "Tux".

ReTux

Action platformer starring the Linux mascot, Tux

World War II rages and nations fall. SS head Himmler has Hitler's full backing to twist science and the occult into an army capable of annihilating the Allies once and for all. Battling alone, you're on an intense mission to pierce the black heart of the Third Reich and stop Himmler -- or die trying.The intent of this project is to provide a baseline RTCW which may be used for further development and fun. The map editor and associated compiling tools are not included. We suggest you use a modern copy of GtkRadiant. Some of the major features currently implemented are:SDL backendOpenAL sound API support (multiple speaker support and better sound quality)Full x86_64 supportAVI video capture of demosMuch improved console autocompletion &amp; Persistent console historyColorized terminal outputMuch improved QVM toolsMany, many bug fixesCommercial data files are required to run the supported games. These can be aquired though a multitude of sources. See the manual for more info on this.

IO Return to Castle Wolfenstein

Game engine for Return to Castle Wolfenstein

A simple and fun game of crosswords. Load your crossword files, or play one of the included games. Features include:Support for shaped and colored crosswordsLoading .ipuz and .puz filesHint support, such as showing mistakes and suggesting wordsDark mode supportLocally installed crosswords as well as support for 3rd party downloaders

Crosswords

The objective of KBreakOut is to destroy as many bricks as possible without losing the ball.The player is presented with a game field containing a number of bricks. A ball travels across the screen, bouncing off the top and side walls. When a brick is hit, the ball bounces away and the brick is destroyed. The player loses a life when the ball touches the bottom of the field. To prevent this from happening, the player has to use a movable bar to bounce the ball upward, situated at the bottom of the window. The purpose of the game is to progress through the levels destroying all bricks present in each, and trying to get a highscore.

KBreakOut

Turn your steam deck into a windows controller (Or use any controller from a Linux PC on windows). Connect linux to windows over the network in order to bind an emulated controller on windows to the same inputs you're doing on linux. Useful for playing games that might lack support for your controller out of the box, or just need another controller despite running out of USB portsTested controllers:DualSenseDualshock 4Logitech Gamepad F310Nintendo Switch Pro ControllerSteam ControllerSteam DeckXbox One (+ series) controllerOther controllers likely work too as long as the godot game engine supports it.Note: you will need to install ViGEm and the godotGem server on windows. (See releases: https://github.com/iSlammedMyKindle/godotGem/releases)

godotGem

Controller client to emulate an xbox360 controller for windows

gbrainy is a game to train memory, arithmetical, verbal and logical skills with many sorts of exercises of different difficulty levels.It should have something for all ages and purposes: kids whose parents want them to develop their capabilities, adults that want to keep their mind in form or just try it out for fun, older people that might need to do some memory exercises, etc.

gbrainy

gbrainy is a game to train memory, arithmetical, verbal and logical skills.

Naval Battle is a ship sinking game. Ships are placed on a board which represents the sea. Players try to hit each others ships in turns without knowing where they are placed. The first player to destroy all ships wins the game.

Naval Battle

YSoccer (formerly Yoda Soccer) is a project which intends to create a new desktop game with the gameplay and the style of the well known Sensible World of Soccer (a.k.a. SWOS). It is however not just a clone, but it expands upon the original formula with new features and improved graphics.

YSoccer

Katawa Shoujo is a bishoujo-style visual novel set in the fictional Yamaku High School for disabled children, located somewhere in modern Japan. Hisao Nakai, a normal boy living a normal life, has his life turned upside down when a congenital heart defect forces him to move to a new school after a long hospitalization. Despite his difficulties, Hisao is able to find friends—and perhaps love, if he plays his cards right. There are five main paths corresponding to the 5 main female characters, each path following the storyline pertaining to that character.The story is told through the perspective of the main character, using a first person narrative. The game uses a traditional text and sprite-based visual novel model with an ADV text box.Katawa Shoujo contains adult material, and was created using the Ren'Py scripting system. It is the product of an international team of amateur developers, and is available free of charge under the Creative Commons BY-NC-ND License.

Katawa Shoujo

Kapman is a clone of the well known game Pac-Man.You must run through the maze to eat all pills without being captured by a ghost. By eating an energizer, Kapman gets the ability to eat ghosts for a few seconds. When a stage is cleared of pills and energizer the player is taken to the next stage with slightly increased game speed.

Kapman

OpenTyrian is an open-source port of the DOS game Tyrian.Tyrian is an arcade-style vertical scrolling shooter.  The story is set in 20,031 where you play as Trent Hawkins, a skilled fighter-pilot employed to fight MicroSol and save the galaxy.Tyrian features a story mode, one- and two-player arcade modes, and networked multiplayer.

OpenTyrian

An open-source port of the DOS shoot-em-up Tyrian.

openMSX is an emulator for the MSX home computer system. MSX was a standard for Z80-based home computers, and was a (largely) Japanese attempt to establish a single standard in home computing similar to VHS in video.The MSX standard was designed by ASCII Corporation in Japan, in cooperation with Microsoft Japan. The later of which provided the extended BASIC for the machine.In addition to emulating MSX, MSX2, MSX2+, MSX Turbo R and many of it's peripherals, openMSX also supports emulating the ColecoVision and Sega SG-1000 game consoles and the SpectraVideo SVI-318 and SVI-328 home computer systems.Note: by default the openMSX emulator only ships with the C-BIOS open-source BIOS implementation. This BIOS is restricted to cartridge based MSX games. For a full MSX or SVI emulation it is necessary to provide your own MSX and/or SVI BIOS ROMs, which must be placed in the ~/.openMSX/share/systemroms directory.

openMSX

Emulate all aspects of the MSX with high accuracy

Athenaeum is a game launcher and manager designed as a libre replacement for Steam.It's built with PyQt5 and utilizes the flatpak application container system.

Athenaeum

HDOS, or High Detail Old School, is a free-to-use third party client for Old School RuneScape that emulates the era of 2008-2011 RuneScape HD.

HDOS

Urban Terror could best be described as a Hollywood tactical shooter; it is realism based to a certain extent (environments/weapons/player models), but also goes by the motto "fun over realism" (fast gameplay and lots of action). This combination of reality and action results in a very unique, enjoyable and addictive game.

Urban Terror

Tactical first person shooter with action movie elements