Adam Szabo has released Phazor, a free effect plugin, designed to emulate the phaser effect found in the Virus synthesizers:

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 Windows only and is available now as a free download via Szabo’s site.