Bartosz Milewski's 'Category Theory for Programmers' unofficial PDF and LaTeX source

Competitive Programmer's Handbook

A high-speed network driver written in C, Rust, C++, Go, C#, Java, OCaml, Haskell, Swift, Javascript, and Python

A fresh implementation of Common Lisp

A concise reference for Erlang

Unix system programming in OCaml book

An operating system written in, but especially inspired by Common Lisp and its interactive environment.

Literate Programming Tutorials

snickerdoodle user manual

Parsing the Common Lisp draft specification TeX sources

Course material

sly-slepper

A specification of an improvement to the Common Lisp standard