tonic: A native gRPC client & server implementation with async/await support.
iter-python-rs: Python generator expressions and 'list' comprehensions
(This was mentioned before by @Yandros but not suggested yet)
Watt, a WebAssembly runtime for procedural macros, to shorten compile times and provide isolation and determinism.
Thanks to @dtolnay !
Grubbnet, a TCP client/server library for networked applications and games. It's the first open source crate I have released, thought I'd mention it here!
cookie-factory: serialization library built with a combinator design similar to the nom parser combinators library
displaydoc: A derive macro for implementing the display Trait via a doc comment and string interpolation
ffizer is a files and folders initializer / generator. Create any kind (or part) of project from template(s). Useful to bootstrap or update a project.
easy-ext and extend allow you to create extensions for types you don't own with extension traits but without the boilerplate!
Ldap3 is a great library if you have to work with LDAP or Active Directory. Bonus: the library author was very responsive and helpful when I had questions about how to use certain features and that was much appreciated.
ultraviolet: This is a crate to do basic, computer-graphics-related, linear algebra, but fast, by taking full advantage of SIMD