Show HN: Leviathan, a Clojure IDE for MacOS
github.com4 years since last commit and at version 0.0 - not likely to be relevant to that many.
It may not necessarily be in active development, but it's a project I'm very proud of. It's a legitimate text editor built from the ground-up in Objective-C including its own parser and lexer, and the ability to read theme configuration files. I'm very happy with it and I think it stands on its own as an interesting project.