Juno is a modern web-based IDE for J accessible at https://jsoftware.github.io/juno/app/. It runs entirely in the user's browser using WebAssembly to run J interpreter, ensuring privacy.
Information about releases and new features is posted on the J forum. The thread about Juno on J Forum is also a great place to ask questions, post feature requests and report bugs. If you're not subscribed to the forum, please create a GitHub Issue instead.
Happy coding! Marcin Żołek