Commander Keen: Galaxy Reimagined is a fangame developed by namida (yes, the same namida from the Lemmings community).
Commander Keen: Galaxy Reimagined is developed in C# using the MonoGame framework and .NET 8.0.
The following general free / open-source apps were extensively used in development of this game:
Additionally, several Keen-specific tools, most notably KeenGraph, were used to extract graphics and metadata from the official games.
Commander Keen: Galaxy Reimagined's engine is written from scratch, and is neither forked from nor based on any reconstruction or other clone of the official Commander Keen games.
Commander Keen: Galaxy Reimagined is open-source under the MIT licence. The source code is available here: https://bitbucket.org/namida42/galaxyreimagined/
Special thanks to the following members of the PCKF community for beta testing: Catsarefuclingepic, Arnulf, JSO_x, berfberfy