The original Snooty language server started as an internal project of MongoDB inc. and was released on GitHub with full source code,
https://github.com/mongodb/snooty-parser
LeXtudio Inc. has been maintaining this fork with the following improvement,
- Basic autocompletion on file references.
- More directives and roles support.
- Other patches.
This fork has been published to PyPI and used by many users as default language server of the reStructuredText extension for Visual Studio Code,
https://github.com/vscode-restructuredtext/vscode-restructuredtext