Eigen is a C++ template library for linear algebra: vectors, matrices, and related algorithms. It is versatile, fast, elegant and works on many platforms.
Stitch lets you keep your templates and pages neatly separated from each other in different files. It dynamically stitches the template and page together, and keeps the runtime overhead to a minimum as compared to most templating engines.
A library for making high-quality scientific graphics.
An RPN calculator for the X Window system