Yes, I'm in a LTR with my partner of 10 (!) years, we have a kid who is incredibly important to us, and he and I are also poly. So we date people outside of our relationship. Hope that's not too confusing to you.
If it is (or even if it isn't), I'm also definitely in the market for meeting new people who want to hang out with or without kid(s), play tabletop RPG, chat about anything or nothing, ride bikes, wander the farmer's market, or whatever else strikes our fancies.