Homegrown Sounds has introduced Orgone & Orgone Lite, VST instruments designed for creating “exotic landscapes, hypnotic rhythms and organic sound.”
Description:
Orgone is suitable for any use, but excels at Pads/Atmospheres and BPM based Rhythmic Sequences. It has a customizable randomize system which makes creating new patches on the fly, an instantly rewarding process.
It consists of 2 [...]

Ninecows has released The Putney v2.0 (.zip download link), a freeware architectural replica (SynthEdit) of the EMS Putney. The plug-in runs as a VST effect, not a VST instrument.
Description:
As the original it is constructed of basic modules connected in a matrix, letting you route sources and control voltages to different destinations. Many module based synths [...]

Applied Acoustics Systems has updated its entire product line for compatibility with OS X.
Their entire product line: Tassman 4, Lounge Lizard EP-2, Ultra Analog VA-1, and the upcoming String Studio VS-1, is now compatible with Mac OS X 10.4 (Tiger).
An update for registered users is available free of charge from the Applied Acoustics website.