It’s all D&D (5e) for me.
Running: Verdenspire - A campaign that started out as an idea for running the Dragon Age RPG, which is why it’s all (mostly) set in one city (a la Dragon Age 2). But switched over to D&D when a friend expressed a desire to play some D&D and offered a venue to play (plus I knew the rules better). Had a quick stop off along the way to steal some setting ideas from The Spire (the RPG and the totally unrelated comic of the same name).
It’s my own world, but only really in the sense that I didn’t want the weight of already established lore to deal with. I’ve got the main concepts sketched out and I fill in stuff when the adventure needs. It takes a lot of inspiration from late-era Discworld and Eberron for what kind of fantasy world it is. More technologically advanced than standard D&D, but more magic-based.
Other elements have ended up being introduced just because I like them or I’ve had a silly idea. Like I’ve chucked in a major connection to the feywild as an excuse to use lots of fey creatures and eladrin.
Or the wizard who was building a zoo full of magical creatures.
Playing: I’m in two campaigns that consist of mostly the same people, just with different DMs (who are playing in each other’s campaigns).
One is set in a small city during a mayoral election. I’m playing an aasimar hexblade warlock who’s obsessed with the Raven Queen. Basically the D&D version of a woman who was a goth as a teen and then kept with it into her 30s and became a Wiccan. Except instead of opening a shop selling crystals, she found a magic weapon and made a pact with its creator.
She’s just found out her girlfriend isn’t just an innkeeper and actually isn’t human at all. (OOC I’ve worked out she’s a dragon, but Kari doesn’t quite know that yet). So I’m interested to see where that goes.
The other has just started (we’re about 3 sessions in), so we’ve mostly done odd jobs for the city watch. In that I’m playing a shifter swords bard (my avatar is a portrait of her that my friend Chrissie drew). Rather than go with something sensible, I made her a raccoon shifter 
She was adopted by an old dwarf blacksmith, but sucked as an apprentice, so she’s gone off to find adventure.