Owen Hargreaves is available, that is one person you would not want, good player but ****ing bad injuries, however Man City have also released someone called, Gai Assulin, he is an ex Barcelona youth player who signed for Man city in 2010, suppose to be a good player, but has spent a bit of time out on loan, may be a good player for you, not good enough for a top Premiership team like Man City, but he could be great at Soton.
Bolton have let a few go like Nigel Reo Coker and Ivan Klasnic who may be worth looking at and maybe Paul Robinson but not many others that are good, but that is enough of players who are being released, I think someone like Matt Jarvis would be good for Soton or maybe even Jamie O'Hara, both really good players for Wolves and if it wasn't for them Wolves would have probably struggled to get any points.