trio

uvloop

Ultra fast asyncio event loop.

gevent

A coroutine-based Python networking library that uses greenlet.

Twisted

An event-driven networking engine.

anyio

A high-level async concurrency and networking framework that works on top of asyncio or trio.

asyncioStandard library

Asynchronous I/O, event loop, coroutines and tasks.

concurrent.futuresStandard library

High-level asynchronous execution of callables.

multiprocessingStandard library

Process-based parallelism.