Real time satellite tracking and orbit prediction
Library to control radio transceivers and receivers
Model Railway CAD program
OpenGrADS provides extensions and interfaces for GrADS.
2D & 3D TeX-Aware Vector Graphics Language
Open source cross-platform Java Visual Traceroute
For exploring cellular automata like Conway's Game of Life.
Open source Health IT for the planet
OpenGL Mathematics (GLM)
SUMO is a microscopic, multi-modal traffic simulation.
TI graphing calculators <-> computer communication software
Viking is a free/open source program to manage GPS data
CloudCompare main repository
SciPy library main repository
Open source finite element software for multiphysical problems
OctoPrint is the snappy web interface for your 3D printer
C++ library for half precision floating point arithmetics.
Structure-from-Motion and Multi-View Stereo
Google's software suite for combinatorial optimization
Numerical Bifurcation Analysis Toolbox in Matlab
PDF scientific paper translation with preserved formats
A 3D simulator game where you can drive, fly, and sail