WOK tells us that REFO-D is a delay plugin with a reverse-forward option. Additionally there is a filter and distortion in the feedback path. The delay time can be set in milliseconds or synced to host.
REFO-D is available for free as a 32bit VST plugin for Windows.
Pricing and Availability:
Free download. Donations welcome.
A look at the Electro Harmonix collaboration modules