Best Service has released Titan Free, a free software synth for Windows and Mac:
Get your free copy of our brand new TITAN Synthesizer now and discover how to make a big sound experience in our Sample Player ENGINE based on 12 great TITAN multi samples! Did you know that you can even import up to 24 of your own samples (per layer) into ENGINE? Make your experience with this unlimited version of ENGINE - more than a sample player - and the free TITAN demo content now!.
Note that Titan Free is a fairly gargantuan download (over 325 MB).