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Async & concurrency

Async I/O, promises, coroutines and reactive streams. 89 packages across 8 ecosystems.

RstokioAn event-driven, non-blocking I/O platform for writing asynchronous I/O backed applications.1.54.1Oct 21, 2026MITRsmioLightweight non-blocking I/O.1.2.4Oct 3, 2026MITRsfutures-utilCommon utilities and extension traits for the futures-rs library.0.3.34Aug 11, 2026MITRsfutures-coreThe core traits and types in for the `futures` library.0.3.34Aug 11, 2026MITRstokio-rustlsAsynchronous TLS/SSL streams for Tokio using Rustls.0.26.6Sep 28, 2026MITRstowerTower is a library of modular and reusable components for building robust clients and servers.0.5.3Jan 12, 2026MITRsparking_lotMore compact and efficient implementations of the standard synchronization primitives.0.13.0Oct 21, 2026MITRstower-serviceTrait representing an asynchronous, request / response based, client or server.0.3.3Aug 13, 2024MITRstokio-utilAdditional utilities for working with Tokio.0.7.20Oct 9, 2026MITRsfuturesAn implementation of futures and streams featuring zero allocations, composability, and iterator-like interfaces.0.3.34Aug 11, 2026MITRsasync-traitType erasure for async trait methods0.1.92Aug 8, 2026MITRsrayonSimple work-stealing parallelism for Rust1.12.0Apr 14, 2026MITRscrossbeam-channelMulti-producer multi-consumer channels for message passing0.5.17Sep 5, 2026MITRstokio-streamUtilities to work with `Stream` and `tokio`.0.1.19Jul 22, 2026MITRstokio-tungsteniteTokio binding for Tungstenite, the Lightweight stream-based WebSocket implementation0.30.0Jul 11, 2026MITRstonicA gRPC over HTTP/2 implementation focused on high performance, interoperability, and flexibility.0.14.9Oct 29, 2026MITRswasm-bindgen-futuresBridging the gap between Rust Futures and JavaScript Promises0.4.80Oct 30, 2026MITRsdashmapBlazing fast concurrent HashMap for Rust.6.2.1May 17, 2026MITRsfutures-liteFutures, streams, and async I/O combinators2.6.1Aug 4, 2025Apache-2.0Rstokio-testTesting utilities for Tokio- and futures-based code0.4.6Sep 25, 2026MIT