Async executor

Asynchronous signal handling

A thread pool for isolating blocking I/O in async programs

A simple and fast random number generator

Async networking primitives for TCP/UDP/Unix communication

Duplicate an async I/O handle

Futures, streams, and async I/O combinators.

Async multi-producer multi-consumer channel

Compatibility adapter between tokio and futures

std::time, tokio::time, tokio_util::time Replacement for WASM targets.