Smart Cache is full-featured pure Java proxy cache server. It can cache any pages and make them available for offline browsing. Other features include a URL filter, cookie filter, ability to fake User-Agents, Referer, and Cookie headers, Web forwarder (accelerator) mode, background downloading, multiple logs, fast operation, very configurable garbage collection, cache directory structure copies server structure, and cached files are ready for use (no headers inside).
The OpenAI project is centered around the advancement of Artificial Intelligence. It is geared toward developing specifications for AI and a default implementation for a set of well-known AI tools. The genetic algorithm is written in Java and is built in a modular fashion so that new algorithms and evolution rules can be created.
PHPMailer is an email transport class which features multiple file attachments, CCs, BCCs, REPLY-TOs, HTML messages, redundant SMTP servers, and word wrap, among others. It can send email via sendmail, PHP mail(), or with SMTP. Methods are based on the popular AspEmail active server component.
dbMan is a complex SQL monitor for common database systems (PgSQL, Oracle, MySQL etc.). It's based on Perl and DBI interfaces. Features include a command history buffer, tab completion, editing Oracle objects, simultaneous connections, SQL help, importing and exporting of tables, Oracle explain plan, and more. dbMan is made as a simple kernel and many extension modules, and you can make your modules with a simple HOWTO.
vetetris is a game written in Java. It's similar to tetris, but it is played in 3D. There are figures which are falling that have to be placed in the right manner. You can rotate the blocks in six different directions and move them in five directions. As time goes on they move faster and faster, and it gets harder to put them in the right spot.