Adam Szabo has released Phazor, a is a free phaser effect plugin for Windows.
Phazor is a free effect plugin, which emulates the phaser effect found in the Virus synthesizers, which helped make its characteristic sound. A lot of time was devoted to make it sound very close to the original and every control has been carefully adjusted to behave just like the phaser from the Virus.
It has selectable 1 to 6 stage all-pass filters controlled by an LFO, with spread and feedback controls. The plugin is highly optimized and its CPU usage is minimal, allowing for multiple instances to be used in a project.
Phazor is avaialble to download as a freeware VST effect plugin for Windows.