Honestly, I've been playing around with the idea to start something new. But there isn't anything that pulled the trigger for me yet so it's probably one of "those projects" that will get neglected. While I was playing with the thought, I was checking out which software suits me best.
I checked vBulletin, Woltlab, XF and Invision Community.
vBulletin is too outdated, boring. Woltlab is kinda cool but lacks some features when compared to XF. Invision Community is nice but lacks in 3rd party add ons. It's more expensive than any of the competitors but it's packed with more features. I own a license, but IC wouldn't be my first choice to start something on because of the 3rd party add ons it lacks and due it being more generic than any other IC board. Great for their audience, not so much for ours.
So IF I'd go with a new project, my choice would still be XF. Despite their lack of development. It's still better than any other platform due the 3rd party add offering.
TLDR: 3rd party add ons are superior for any modern webmaster looking to make a great community. XF is the only one with a gigantic database of add ons. The rest not so much and will end up looking more generic. While 3rd party add ons, don't break or make a community, they still play a crucial role in enhancing your community.