metals is language server for the Scala Programming language. It's been an absolute pleasure to be part of this team. I'm a regular contributor to this project and wrote the coc-metals Vim client, and have been working on the nvim-metals plugin for those seeking to have an LSP experience natively in Nvim.
This project has been one of the first tooling projects that I've gotten involved with, and for many reasons it has caused me to be more and more interested in the world of developer tooling. The entire Scalameta project is brilliant. The organization holds a ton of great libraries like scalafmt, mdoc, MUnit, and more.