IK Multimedia are giving away their Oberheim OBX-a synth, the Syntronik OXa, for free. All you've got to do to get the epic sound library that features 6,500 samples and 156 instruments, is to subscribe to the company's newsletter before June 17th. The samples work inside IK's own Syntronik plugin, which is their own sampler instrument. A free version of the sampler is available. Subscribe here to get the plugin.
Arturia recently launched their own emulation of Oberheim's OBXa.