I put some features to them. Feel free to edit it, if you think its to much.
Its mostly from the about section of the original sites.
Krita
Digital painting and illustration application also for pixelmanipulation.
CMYK support, HDR painting, perspective grids, dockers, filters, painting assistants, Gmic
Blender
3D creation suite.
Modeling, rigging, animation, simulation, rendering, compositing, motion tracking, video editing and game creation.
API for Python scripting to customize the application and write specialized tools
Magic Lantern
A software add-on that runs from the SD/CF card and adds a host of new
features to Canon EOS cameras that weren’t included from the factory by
Canon.
Categories are audio, exposer, live view overlays, movie, shoot, focus
Gimp
A versatile graphics manipulation package like Photoshop.