Utility classes, APIs and tools for Java
Data Structures and Algorithms in Python
The Utah Raster Toolkit 3.0, patchlevel 2
Fast compression of integer sets.
Some basic matrix algorithms implemented in C
PAK is a collection of library code to handle the overhead of coding
The solution to all your problems
Toolkit for Automatic Control and Dynamic Optimization
Tcl library of packages focusing on functional principles
Conservative "garbage collection" memory management library