2D Oldschool platform game where you control a rooster

pekka-kana-2

2D Oldschool platform game where you control a rooster

Your mission in Pekka Kana 2 is to save Pekka's chicken friends from an evil crow.
arcade game featuring Free Software mascots

xtux-client

arcade game featuring Free Software mascots

Square bricks -- superblocks mode

galois

falling blocks game with blocks of various shapes and sizes

Galois is a computer game of the "falling blocks" type, but with unique features. Unlike most other games of that type, it is not limited to blocks made of four two-dimensional, square bricks: you can choose among several different brick shapes, blocks composed of more or fewer bricks, and even between two- and three-dimensional games.
I won!

tictactoe

tic-tac-toe game written in Ruby

two-player board game with randomness

el-ixir

two-player board game with randomness

El-Ixir is a board game that has apparently been invented by Isoft in 1981, released as a booter floppy. This is a quite faithful remake, like the original using text-mode graphics.
screen from walktest application

crystalspace

Multiplatform 3D Game Development Kit (binaries)