In addition to these, here are some more that I've either used before, or have discovered recently.
Key:
- ✓: Next to test.
- ✓✓: Tested
- ✓✓✓: Tested and committed.
- x : Dismissed.
Essential
- Entity Construction Kit (ECK): Urgent. I think metadata entities (and taxonomy terms) rather than nodes is where the majority of our metadata lives.
- Feeds, Feeds Tamper, etc.: Urgent.
Probably Useful
- Tagify: Makes entity reference fields less clunky. Don't hate the way it looks, but I worry it's less intuitive/accessible.✓
- Rate: Or something like it. I'm thinking on actions that are proposals for general consideration.
Maybe Useful
- UI Suite: I have to say I don't entirely understand all this. Could be useful for UX way down the track.
- Views Dependent Filters: Maybe.
- Views Any Route: Meh.
- Bibliography & Citation: Looks finicky.
- ISBN Field: Seems to do simple validation. Simple is good.
- Editor Advanced link: I don't know about this, TBH.
- Primary Entity Reference: Maybe there's a case for this somewhere.
- Dynamic Entity Reference: Maybe necessary in an extreme case, but I don't fancy explaining it to anybody.