Lima

Lets go down the list!

4 non-open source 3rd party (ASYNC worldedit, etc.)

28 custom (nexus-core, archecore, horsehelper, customitem, etc.)

37 open source 3rd party (essentials, multiverse, pex, etc.)

2 unknown (odd ones included for MCMA)

So, out of these we have about 6 plugins we dont have access to source for, 28 which we privately host source, and 37 that we can access at any time and make adjustments (which we have done, a few edits of our own to open source plugins to make them lotc-friendly)

And out of the custom plugins, we have 100% source access.