Vipsdisp can display huge (many, many gigabyte) images quickly and without using much memory. As well as the usual PNG, JPG, TIF, PDF, SVG, WEBP, JP2, JXL and GIF, it supports many scientific and technical image formats, including SVS, MRXS, OpenEXR, FITS, Matlab, NIfTI, Analyze, and PFM. Vipsdisp supports pixel types from 1 bit mono to 128-bit double precision complex, you can convert image formats, it support copy-paste and drag-drop, and it has a range of useful visualisation tools and display modes.