RealSynth.Net (formerly known as DeBoo) has released two free VST effect plug-ins for Windows - Spirasuid and Vulcanuid, which are both ping-pong delays.
Spirasuid features:
- Ping-Pong Delay with delay and feedback.
- Reverb with width, damping and room-size.
- Volume Control.
Vulcanuid features:
- Ping-Pong Delay with delay and feedback.
- Reverb with width, damping and room-size.
- Parametric EQ.
- Built in Compressor.
- Volume Control.