Joking Hazard, by Cyanide and Happiness. You basically make collaborative cyanide and happiness comics, and it's absolutely hilarious. Like Cards Against Humanity but with visuals.
SuperFight. Like Cards Against Humanity but you build superheros, monsters and celeb villains to fight each other Kong vs Godzilla style. It can get ludicris, in a good way.
I own 50+ board games so I'm having troubles figuring out a single favorite. But Blokus is a crowd favorite as well as Tsuro. I'm currently big into Dice Masters.