Lust

https://github.com/ZekeMedley/lust 

A lisp JIT compiler and interpreter

Monkey

https://github.com/vishpat/monkey-rs 

Another interpreter for the monkey programming language in Rust. Writing An Interpreter In Go is a phenomenal book to learn on how to write an interpreter for a programming language in Go.

LISP

https://github.com/vishpat/lisp-rs 

A simple Lisp interpreter/library in Rust. The interpreter/library was initially developed as a teaching aid to explain how Lisp interpreters work and how can they be implemented using the Rust programming language.

petushki

https://github.com/sunng87/petushki 

A simple static HTTP server in Rust, for learning and local doc development Resources

toyDB

https://github.com/erikgrinaker/toydb 

Distributed SQL database in Rust, written as a learning project

mini-redis

https://github.com/tokio-rs/mini-redis 

mini-redis is an incomplete, idiomatic implementation of a Redis client and server built with Tokio.

SQLRite

https://github.com/joaoh82/rust_sqlite 

Rust-SQLite, aka SQLRite , is a simple embedded database modeled off SQLite, but developed with Rust. The goal is get a better understanding of database internals by building one.

minisudo

https://github.com/ogham/minisudo 

A little privilege escalator in Rust, for learning.