RetroArch is a frontend for emulators, game engines and media players.
An Open Source DOS emulator to run old DOS games
An award-winning drawing program for children of all ages
A free transportation simulator game
A very efficient tutor.
A cross-platform port of Hexen II game.
For exploring cellular automata like Conway's Game of Life.
Colonize the New World.
3D Engine c++
C64/Amiga emulator with PAL shader and runAhead
A promising chess program
4X Space Strategy Game
GemRB is a portable open-source implementation of the Infinity Engine
GEDKeeper - opensource and crossplatform genealogy management program
You can choose multiple versions of MCBE to play.