2D Particle Effect Editor

For what it is worth, this video shows a nice JavaFX-based particle program. Links to source code are provided in the comments. It’s not an editor, per se, but it could be very valuable reference for making one.

I’m pretty sure someone at JGO made a particle editor in the last 5 or 6 years, but I can’t recall who. (Nate? StumpyStrust?)