Free] Introducing Geraint's JSFX with over 10 high quality JSFX - Chillout with Beats
The Reaper Blog - I discovered this beautiful JSFX in my ReaTeam folder yesterday and was totally blown away by it. Awesome for bass DI. Pretty cool for kick and snare too.
GUI for JSFX - Cockos Incorporated Forums
A Real-Time JSFX Audio Denoiser for REAPER | Page Fault
How to write a Reaper MIDI JSFX from scratch - A guide for the COMPLETE newbie