Suggestion required

Hello, can somebody suggest me some library, which I can use in proprietary project (LGPL license or similar required), which will allow me to use cross-platform implementation of sockets, threads, mutexes etc? I am choosing between ACE and GNU CommonC++ now, but not sure if ComonC++ is distributed under LGPL, and the documentation of this library is pretty poor (as for beginners) ... ACE license seems to looks better, but it's so complicated :)