Helix Toolkit is a collection of 3D components for .NET
A charting and data visualization library for Unity
FlightGear Flight Simulator: free open-source multiplatform flight sim
rayshade and POV for Mathematica Export + view
GUI for MOPAC, DFTB+, GAMESS, Firefly, NWChem, ORCA and PSI4
Out-of-Core hybrid Apache Arrow/NumPy DataFrame for Python
a very lightweight advanced terrain-rendering and 3D map rendering sys
Simple calculator that can handle dates and time.
Pear3DEngine is a modern and modular 3D development framework
Data logging and visualization in 2D and 3D for STMs.