Keeping Clojure open source sustainable The Clojure ecosystem is built on open source. From the Clojure and ClojureScript projects, to the build tools, web frameworks, and the hundreds of innovative and useful libraries that we all depend on every day. The pervasive use of open source has enabled a flourishing Clojure ecosystem, but it also has some hidden downsides. The vast majority of Clojure projects are maintained by a small handful of people, often only one person.