Python asyncio - (https://docs.python.org/3/library/asyncio.html) - (Python standard library) Asynchronous I/O, event loop, coroutines and tasks.

Python awesome-asyncio - (https://github.com/timofurrer/awesome-asyncio)

Python trio - (https://github.com/python-trio/trio) - A friendly library for async concurrency and I/O.

Python Twisted - (https://twistedmatrix.com/trac/) - An event-driven networking engine.

Python uvloop - (https://github.com/MagicStack/uvloop) - Ultra fast asyncio event loop.