pyUrlMin
Ultra-minimalist Python/Mongo URL Shortner
With as little code as possible, this micro-app creates shortened URLs, stores them in MongoDB using the Flask framework.
Currently in use on https://findmate.app and http://urltools.io/
HOWEVER:
This should not really be used in a high-volume production environment and should really be used for educational purposes only. I assume no liability for mis-use of this app, use it at your own risk. There are potentially security issues, so be forewarned that this is just for TESTING only.