"Farspice, a melange odyssey" is an action game with some strategic elements. The goal of the game is to store in your base as much as possible of harvested spice (melange). You must defend the spice from many alien waves around many planets. You can sell the saved spice to buy weapons or upgrades for your base.
Five Hundred is a card game for four players similar to Euchre or Bridge, especially popular in Australia and New Zealand. The wikipedia page has a comprehensive description of gameplay. This version is implemented in C++/Qt. It incorporates graphics from the svg-cards project. Computer players are scriptable in Lua.
Anywhere Board Games (ABG) allows users to play board and card games on the Web in real time on multiple machines (PC, Linux, iPhone, iPad, and Android). ABG runs as a Google+ Hangout App or as a standalone PHP app. Unlike other gaming environments, this one has a peculiar vision: projecting the main board on our table and using laptops or tablets to control players' hands (with other friends joining in remotely). It supports flipping, stacking, rotating, rolling, and shuffling of pieces, so most board and card games are playable.
Quabro is an arcade game in which the goal is to destroy colored blocks with a ball using four paddles on each side of the screen to steer the ball and keep it on the field. It is inspired by Breakout and Arkanoid, as well as several of clones created later. It is written in Python using the Pygame library.