Extensible Line-drawing & Polygon-filling Rasterization Libs for Java
opbdp (non-linear) pseudo-Boolean optimization
Simple Long Integer Math for C++
Mixed Integer Linear Programming (MILP) solver.
World's first open source data quality & data preparation project
Numerical models for chemical and process engineering
sparse and dense matrix, linear algebra, visualization, big data
Fixed-length Arithmetic-types library
Very basic computer vision program