Particle Trails
Freeware
Particle Trails
Particle Trails lets you make spline paths from the trail of particles. The gif below shows particles emitting and being blown by the wind. The path of these particles are then converted to splines paths using Particle Trails.
Select the start and end frames of the particle animation you want to capture. Sample rate gives you one point for each particle every frame, every other frame, etc. A sample of 12 gives you a point for each particle every 12th frame. It is easy to quickly get a great many points so be careful of this setting.