Veloren - A community-driven multiplayer voxel RPG written in Rust.
Chumsky - A parser combinator crate designed to be easy to use, expressive, and with powerful error recovery.
Ariadne - A fancy compiler diagnostics crate.
Tao - A statically-typed functional language with polymorphism, typeclasses, sum types, pattern-matching, first-class functions, currying, good diagnostics, etc.
Flume - A blazingly fast multi-producer, multi-consumer channel with sync/async support, timeouts, etc.
Euc - A software rendering crate that lets you write shaders with Rust