FAIR Chemistry's library of machine learning methods for chemistry
An implementation of a quantum simulator that you can run locally
Selenium-python but lighter: Helium is the best Python library
Geographic library
Open Source Computer Vision Library
LMS SuperDateTime Weather.com Plugin
An interior design application to draw house plans & arrange furniture
A cross-platform statistical package for econometric analysis
C++ library for half precision floating point arithmetics.
An advanced network simulator to design and configure virtual networks
XFLR5 is an analysis tool for airfoils, wings and planes
A portable, multi-platform, command-line driven graphing utility
GPS log file viewer and analyzer
Computer Algebra System written in Common Lisp
FlightGear Flight Simulator: free open-source multiplatform flight sim
An object relational-mapping (ORM) library for Java