The wiki should be considered as a secondary source for a comprehensive list of 3rd party add-ons for the 5.1 version of Gramps.
Look at the GitHub CSV addons-en.txt list is a continually updated list. It is used by the Plug-in manager(s).
And the Isotammi project has created their own add-ons and that list is good to review too.
There isn’t a similar compilation list for the built-ins. (You can slog through finding them by looking at the gramps registration files.)