GLXOSD is an extensible on-screen display (OSD)/overlay for OpenGL applications running on Linux with X11 which aims to provide similar functionality to MSI Afterburner/RivaTuner OSD. It can show FPS, frame timings, temperatures and more in OpenGL games and applications. It can also be used to benchmark games, much like voglperf.
This program is an On-Screen Display or a Heads-Up Display for keys. It displays every key press at a clearly visible text size. It is developed for people with poor eye sight. It is meant to aid desktop computer usage. It is especially useful while chatting or for occasional typing. The user no longer has to squint or zoom in the entire screen to see what s/he writes in small text fields.
Python bindings for libaosd: an on screen display (OSD) library, which uses Cairo to create high quality rendered graphics to be overlaid on top of the screen.