The Steelhead sims in Second Life are loosely based on the "gaslight fantasy" world of Girl Genius. We have mad science, we have Jaegers in schnappy yooniforms und nize hets, and the Baron... Well, he has his own sim, Europa Wulfenbach, but he comes to all the best parties. Also we've got werewolves, elves, neko, Tinies, furries, and steampunk fae.
Group info is here, there are group joiners near access points in Steelhead City, Steelhead St Helens, and Boomtown.
With the new story arc starting up, looking forward to seeing new roleplayers and residents turning up inworld. There's some roleplay and weekly events in Europa Wulfenbach and Winterfell, too - including poetry slams at Der Hut des Jaegers.
Anyone new to Second Life and interested in checking it out, suggest you join via the link to the Caledon Oxbridge University access point, it starts with an excellent intro to getting around in SL, with friendly people in a newbie-friendly Victorian setting.