Efficient, functional algorithms for generating lazy sequences for common combinatorial functions.

A TDD library for Clojure that supports top-down ('mockish') TDD, encourages readable tests, provides a smooth migration path from clojure.test, balances abstraction and concreteness, and strives for graciousness.

Helper for faking clj-http requests in testing, like Ruby's fakeweb.

An optional type system for Clojure — full system for annotating and type-checking.

Tupelo

Clara Rules Engine

libsodium for clojure

Such functions! Such doc strings!

Clara Rules Engine

Snow

Define types by giving descriptions (perhaps incomplete) of how they're built. "...by how they're built" means applying arbitrary predicates (especially ones about existence) to parts of structures.