shash is a program which produces message digests for files, and checks whether the digest remains the same (i.e., whether the files changed). Since anyone can generate the message digest, it may not be suitable for some security-related applications. Because of this, shash also supports HMAC (rfc2104), which is a mechanism for message authentication using cryptographic hash functions. shash can use a key with a hash algorithm to produce hashes that can only be verified with the same key. This way, you can securely check whether files in a filesystem were altered.
TuxKart is a 3D GoKart racing game with several famous OpenSource mascots participating. The game uses PLIB and OpenGL, and is portable to a wide range of OS's. There are several racecourses provided, with full information on how to add your own. Except for a few minor details, this game is essentially complete, and very playable.
WebRun is a single Java class file that implements a remote class loader and application launcher that can be used to distribute Java applications to clients. This drastically reduces the need to continually update each client as only this class file plus the Java environment is needed on the client. WebRun load JAR and CLASS files from URLs plus it supports basic authentication with HTTP URLs.
Who's Paying for This? is a Python app for payment share calculation. It simplifies the task of figuring out what share of the grocery bills each of roommate is obligated to pay when some items are not used by all roommates. Just launch the script with each person's name as a command line argument and you'll get a GUI. Type in the name of the item on the receipt, the price of the item, check the boxes for the people who are paying for the given item, and click the button to add it to the list. The program keeps a running count, and lists the price paid for individual items.
GEMpire is a simple turn based multiplayer strategy game, written in java, designed to be played over the internet in client-server fashion. It is a generalization of the commercial game Empire Deluxe for the PC. It consists mainly of a server, a client, a map editor, and a random map generator.
DB_Browser is a CGI tool for developers working with any relational database supported by Perl::DBI. It easily facilitates searching, editing, and adding to tables within a database. While it can be used as a regular interface to database data itself, it works well as a supplemental tool for developers creating their own primary interface.