Dobro

Edge2Curve is a Blender add-on that converts edge selections into curves while preserving topology. It handles guides, profiles, and animation paths, detecting loops and open chains with smooth interpolation and clean conversions.

Solid Emitter is a Blender add-on from Dobro that turns any mesh object into a solidbody emitter, launching other objects from it with control over count, direction, velocity, and collision behaviour.