OFELI (Object Finite Element LIbrary) is a library of finite element C++ classes for multipurpose development of finite element software. It is intended for teaching, research and industrial developments as well.
Zhu3D is an interactive OpenGL-based mathematical function viewer. You can visualize functions, parametric systems and isosurfaces. The viewer supports special effects like animation, morphing, transparency, textures, fog and motion blur.
LaTeX Editor based on Bluefish (http://bluefish.sf.net). Main Features: (1) Autotext, Auto-Completion, Function References, Syntax highlight (2) External Tools (customizable) (3) UTF8 support. Winefish is a GTK+ application, released under GPL License.