Straton 
  
Straton is an image processing software that is used by a large community of astronomy photographers, see sample images.  | 
Jetpix 
  
Jetpix is an image compression library that is able to store still images in much less data than JPG. It was evaluated by German magazine c’t in 1999. Re-evaluations happened 2017 and show that it is still able to outperform libraries like JPEG2000.  | 
Cerebellum & Brainfish 
  
Cerebellum is a chess opening library based on a complex automated generation method. It is updated regularly and proofed to be among the leading libraries. It was chosen to evaluate Google’s AlphaZero learning algorithm, see DeepMind Publication.  | 
Aristarch 
  
Aristarch was developed in 2002 and was the first non-commercial chess engine that was able to defeat Crafty. It is still operational and can be used in current chess GUIs.  |