GNUjump is a clone of the simple yet addictive game Xjump, adding new features like multiplayer, unlimited FPS, smooth floor falling, themable graphics, sounds, replays, etc. The goal in this game is to jump to the next floor and try not to fall down. As you go further up the Falling Tower, the floors will fall more quickly. Try to survive longer and get higher up than anyone else.
Keyczar is a cryptographic toolkit designed to make it easier and safer for developers to use cryptography in their applications. It supports authentication and encryption with both symmetric and asymmetric keys. Cryptography is easy to get wrong. Developers can choose improper cipher modes, use obsolete algorithms, compose primitives in an unsafe manner, or fail to anticipate the need for key rotation. Keyczar abstracts some of these details by choosing safe defaults, automatically tagging outputs with key version information, and providing a simple programming interface.
MonoDecrypt uses pattern matching and its knowledge about character frequencies in order to decrypt messages encoded with a monoalphabetic substitution cipher. MonoDecrypt can decrypt texts of any language, as long as it has sufficient information about the language. Depending on the information you give it, the tool decrypts about 50%-100% on its own. Then you can decrypt the remaining data by filling the gaps or correcting bad guesses. MonoDecrypt can also encrypt texts using monoalphabetic substitution.
smupcheck, which stands for Smart Update Checker, checks Web sites for updates automatically, even if they don't offer an RSS feed. It is a very basic tool, and does not offer advanced features such as checking password-protected Web sites, highlighting changes, or filtering results.
spriteconv stitches several individual still images into a single image with all the components side by side, arranged into a specified number of rows and columns. Such output images are typically used in 2D video games to realize the various states of animation for a particular graphical element, known as a "sprite".
VS-Sim is a simulator for distributed systems. It stands for "Verteilte Systeme Simulator", which is the German translation for "Distributed Sytstems Simulator". The project was a diploma thesis at the Aachen University of Applied Sciences, and can simulate various scenarios of the distributed systems lecture at the university.