0 A.D. (pronounced "zero ey-dee") is a cross-platform real-time strategy (RTS) game of ancient warfare. It's a historically-based war/economy game that allows players to relive or rewrite the history of ancient civilizations, each depicted at their peak of economic growth and military prowess.
2x2 (Two by Two) is a multiplication puzzle game. Your goal is to solve a multiplication puzzle in which all digits are replaced by letters. To achieve the best score, you should solve the puzzle with a minimal number of errors and in minimal time. 2x2 is easy to learn, but hard to master. It is simple, smart, and addicting. It will allow you to test and improve your math skills, calculation skills, logic, and even knowledge of probability theory. With a large number of possible combinations, no two games will be the same.
Arx Libertatis is a cross-platform, open source port of Arx Fatalis, a 2002 first-person role-playing game developed by Arkane Studios. Arx Fatalis features crafting, melee and ranged combat, and a unique casting system where the player draws runes in real time to effect the desired spell. The Arx Libertatis source code is based on the publicly released Arx Fatalis sources. This does however not include the game data, so you need to obtain a copy of the original Arx Fatalis or its demo.