KTouch
KTouch is a free and open source typewriter trainer for learning to touch type
Klavaro
Klavaro is a free and open source, multi-platform program designed to teach typing on the keyboard
Dungeon Crawl Stone Soup
Dungeon Crawl Stone Soup is a free and open source game in the Roguelike genre, an adventure through dungeons filled with dangerous monsters in search of the mysteriously fabulous Orb of Zot
KGeography
KGeography is a free and open source program for learning geography (map, information about regions), and you can also test your knowledge
Marble
Marble – free and open source, cross platform software that represents a virtual globe and an atlas of the world
Google Earth
Google Earth – free and crossplatform a virtual globe that provides geographical and cartographic information
KStars
KStars – free and open source, cross-platform virtual planetarium that shows the night sky from anywhere on our planet
Stellarium
Stellarium is a free and open source, multi-platform desktop planetarium, renders 3D photo-realistic skies in real time with OpenGL
Playary
Playary is a free multi-platform program for watching free movies and listening to free music and podcasts
Scorched3D
Scorched3D is a free and open source, multi-platform simple turn-based artillery strategy game in real time