Highly secure and easy to use OTP client written in C/GTK3 that supports both TOTP and HOTP and has the following features:integration with the OS' secret service provider via libsecretsupport both TOTP and HOTPsupport setting custom digits (between 4 and 10 inclusive)support setting a custom period (between 10 and 120 seconds inclusive)support SHA1, SHA256 and SHA512 algorithmssupport for Steam codesimport and export encrypted/plain andOTP backupimport and export encrypted/plain Aegis backupimport and export plain FreeOTPPlus backup (key URI format only)import of Google's migration QR codeslocal database is encrypted using AES256-GCM (PBKDF2 with SHA512 and 100k iterations) and, while decrypted, it's stored in a secure memory area allocated by GCrypt.

OTPClient

GTK+ application for managing TOTP and HOTP tokens with built-in encryption.

Apps by Paolo Stivanin

OTPClient