Nudipedia

Bernard Picton is working on adding nudibranch information to Wikipedia!

That's a pretty big project, but I'll see what I can do to help.

Here's a sample page:
https://en.wikipedia.org/wiki/Dermatobranchus_tuberculatus 

He also showed me iNaturalist.org:
http://www.inaturalist.org/taxa/47113-Nudibranchia