Zampler//RX is a freeware workstation plugin that loads SFZ + REX/RX2 files, based on Synapse Audios Dune synthesizer. It features an arpeggiator, mod matrix, 3 LFOs, 3 envelopes, multi filter, and an effects section. The update brings 64-bit support for Mac OS X, a new skin and new sound bank. Download for free at http://www.zampler.de/ (Windows VST, OS X VST + AU, 32/64bit)
The new sound bank is called Black Venom. It includes 750 MB of sounds and can be download at http://www.zampler.de/upload/
Zampler-Black-Venom.zip (audio demo: https://soundcloud.com/beat- magazin/zamplerrx-black-venom)
More sounds can be found at http://www.zamplersounds.com. A steadily growing source of sound banks for Zampler//RX.