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.
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.
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.
IoBind uses meta-programming and policies to create readers and writers for complex objects at compile time. In other words, it is a code factory that produces customized readers and writers; you give the action to take and the objects to process, and it will generate the corresponding code: STL containers, uBLAS matrices, etc.
SQLpp is an SQL query generation framework for C++ and .NET. Its main features are .NET assembly, automatic SQL code generation, multiple database support, solving table joins puzzles, support for update, insert, and select queries, C# class wrapper generation (generates an entire Data Abstraction Layer), generation of a DAL for DotNetNuke or your application, Graphviz database representation generation, and smart stored procedure generation.