As was posted somewhere else in the thread, Floobits is a collaboration plugin that supports the IntelliJ family of IDEs, as well as Sublime, emacs, and neovim.

As was posted somewhere else in the thread, Floobits is a collaboration plugin that supports the IntelliJ family of IDEs, as well as Sublime, emacs, and neovim. It works really well, even cross-editor. Though I've had a few issues when two users are editing lines too near each other (but the last time I used it was almost a year ago).