Any underrated addons that make Gmod more enjoyable?

I've been searching througn the Gmod workshops and see the usual but creative works of developers,
though not something considerably enjoyable.

If you can suggest/reccomend any addons that fall into the catergory of the titleof this thread, I would be very grateful.

I'd check out gmodstore.com . They have many very cool addons that you will not find on the workshop.
Otherwise, here is a few vehicle things that I like:

WAC Aircraft pack
TDM Cars with VCMOD (from gmodstore)
GBombs is fun

But Multiplayer has a lot more to offer in my opinion, not addonwise but because it is way more fun to play with others