darktable
Description: darktable is an open source photography workflow application and raw developer. It manages your digital negatives in a database, lets you view them through a zoomable lighttable, and enables you to develop raw images and enhance them.
Type: software
Pricing: Free
Screenkey
Description: Screenkey is an on-screen keyboard that displays key presses on the screen. It is designed for presentations, screencasts, and situations where showing keyboard input on-screen would be beneficial. The software is customizable and open source.
Type: software
Pricing: Open Source