As you know Lotus Notes is built on Eclipse so following Eclipse plugins and projects makes a lot of sense from a platform point of view. Surfing the other day I stumbled over an Eclipse project that provides a Ribbon IDE for the Eclipse platform. It makes your mind wander to Microsoft centric but it might make sense for other applications incl. Lotus Notes.
For more info see “Eclipse plug-in sightseeing: Ribbon IDE / Eclipse”. There’s also a PDF showing it off.