Does StardogStudio by any chance use the Language Server Protocol?
It does! And as a belated holiday gift to everyone, we'll be releasing our language server bits open-source in the coming weeks. Keep posted for more details!
Cool! There has been some discussion on the w3c github about editors and LSP has come up in the discussion. It would be great to have something that could interface with Eclipse to help with hand authoring Turtle/TRiG.
fwiw, we've announced what we've been up to here: https://www.stardog.com/blog/language-servers-for-everybody/