A very short post, partly as a reminder for my future self. Check out the following Leiningen plugins: lein-ancient - analyzes your project.clj and lets you know which dependencies are out of date. lein-exec - directly execute Clojure code snippets, or write shell scripts in Clojure! lein-try - start a REPL with various dependencies without needing a project. Great for exploring new libraries! Eastwood - a lint tool for Clojure.