pngcrush is an excellent batch-mode compression utility for PNG images. Depending on the application that created the original PNGs, it can improve the file size anywhere from a few percent to 40% or more (completely losslessly). The utility also allows specified PNG chunks (e.g. text comments) to be inserted or deleted, and it can fix incorrect gamma info written by Photoshop 5.0 as well as the erroneous iCCP chunk written by Photoshop 5.5.
Red Pixel is a platform deathmatch game for two players, played over a serial connection or a LAN. The game involves running around platform levels, picking up guns and ammo, and shooting the other player. The keyboard is used for moving around and the mouse is used for aiming and shooting (like Abuse). Features include a demo recording option and simple map editor.
di is a disk information utility that displays everything that df does and more. It features the ability to display your disk usage in whatever format you prefer. It also checks the user and group quotas, so that the user sees the space available for their use, not the system wide disk space. It is designed to be highly portable across many platforms and is great for heterogenous networks.
MiniD is a scripting language influenced by Lua, D, Io, Python, and other languages. It has a C-style syntax, is dynamically typed, and is designed to be easily embedded within and extended by a larger host application. It is written in (and is designed to be used from) the D programming language. It can also be used as a standalone language. Some external libraries are currently under development, including bindings to SDL, OpenGL, and libpcre.