Links to different resources that I've used in the past or generally find useful
Scala: An awesome object-functional language that runs on the JVM
PyDEC: A python module for Discrete Exterior Calculus.
Caltech Mesh Compendium: A nice little collection of meshes (.obj format)
Boost: Extremely useful collection of C++ libraries.
Qt: My GUI library of choice
Trimesh2: Simple but effective mesh classes/tools
CGAL: Comprehensive computational geometry library (C++)
OpenMesh: Excellent mesh processing library and mesh data structures (C++)
CMake: Do yourself a favor, use this build system
CMake wiki: Useful notes and tools related to CMake
Discrete Differential Geometry: {Sigrapph,Siggraph Asia} course notes