Merchant Empires is a PHP/Python/PostgreSQL-based multiplayer, web-based game of space exploration and economic competition. It is a game of strategy, role-playing, combat, and diplomacy. Merchant Empires is loosely based on both Trade Wars and Space Merchant.
NetBingo is an interactive Bingo game written in PHP and mySQL. NetBingo is designed for webmasters who wish to offer interactive bingo to their site visitors. The game allows any number of players to draw bingo cards and compete against each other to be the first to score a bingo. Features include user registration, choice of bingo game, wins tracking, awards management, chat and more. V3.0 now wholly written in PHP/Mysql and available in free trial, compiled code or open source version.
Uniform Price Markets is a PHP4/MySQL-driven futures market game community (which will drive LinuxFutures.com). It features: Varied user levels and permissions, quote submission, discussion, market creation, pricing & analysis, refereeing, and feedback, and Shubik/Smith market pricing rules.
PHPml is designed to cure boredom on the internet by allowing users to input variables such as verbs, nouns, and adjectives into a story of their choice. Future versions will allow you to choose which story you would like to view, add stories into a database and access them at any time, click a 'randomize' button that will randomly choose a story out of the database, and much more.
(It is not a game!)