Rust crates – frehberg’s annotated catalogue

The base of Rust users and contributors is growing steadily. The amount of libraries (aka crates) at is growing quickly; the overall “noise” is increasing. Some libraries might not be maintained any longer 🙁

This annotated catalogue shall help the Rust-users to find specific, popular, mature Rust crates. This list is WIP (Work In Progress), reflecting my personal shortlist. The ordering in the table top-down doesn’t express any preference.

For more extensive listings, please check out content of (or the categorized search engine and corresponding API-docs at

Other sources of information might be:

nomnom is a parser combinators library written in Rust. Its goal is to provide tools to build safe parsers without compromising the speed or memory consumption.
pestpest is a general purpose parser written in Rust with a focus on accessibility, correctness, and performance. It uses parsing expression grammars (or PEG) as input.
assert_matchesProvides a macro, assert_matches, which tests whether a value matches a given pattern, causing a panic if the match fails.
bytesA utility library for working with bytes.
serdeSerde is a framework for serializing and deserializing Rust data structures efficiently and generically.
serde_jsonSerde JSON serializing and deserializing implementation for Rust.
tokioTokio is an event-driven, non-blocking I/O platform for writing asynchronous applications with the Rust programming language.
romioAsynchronous network primitives in Rust. Romio combines the powerful futures abstractions with the nonblocking IO primitives of mio to provide efficient and ergonomic asynchronous IO primitives for the Rust asynchronous networking ecosystem. Whereas Tokio is using stable Rust-features only, Romio may use so called "unstable" Rust-features from nightly releases.
uomUnits of measurement is a crate that does automatic type-safe zero-cost dimensional analysis.
mockiatoA strict, yet friendly mocking library for Rust
proptestProptest is a property testing framework (i.e., the QuickCheck family) inspired by the Hypothesis framework for Python. It allows to test that certain properties of your code hold for arbitrary inputs, and if a failure is found, automatically finds the minimal test case to reproduce the problem.
test-case-deriveThis crate provides #[test_case] procedural macro attribute that generates multiple parametrized tests using one body with different input parameters.
env_loggerImplements a logger that can be configured via environment variables. env_logger makes sense when used in executables (binary projects). Libraries should use the log crate instead.
gtkRust bindings and wrappers for GLib, GDK 3, GTK+ 3 and Cairo; the popular, platform independent GUI library.
rust-qtDo not use! In contrast to the gtk crate, this GUI library is incomplete and it seems it is no longer maintained.
flutter-engineExperimental! Flutter is Google’s portable UI toolkit for building beautiful, natively-compiled applications for mobile, web, and desktop from a single codebase.
gfxgfx is a high-performance, bindless graphics API for the Rust programming language. It aims to be the default API for Rust graphics: for one-off applications, or higher level libraries or engines.
lazy_staticA macro for declaring lazily evaluated statics in Rust. Using this macro, it is possible to have statics that require code to be executed at runtime in order to be initialized.
regexA Rust library for parsing, compiling, and executing regular expressions. Its syntax is similar to Perl-style regular expressions, but lacks a few features like look around and backreferences. In exchange, all searches execute in linear time with respect to the size of the regular expression and search text. Much of the syntax and implementation is inspired by RE2.
memmapA cross-platform Rust API for memory mapped buffers. May be used to speed-up file-IO.
randA Rust library for random number generation. Rand provides utilities to generate random numbers, to convert them to useful types and distributions, and some randomness-related algorithms.

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