Particles used to exist for Poser. It stopped working after a python update a few years back and was never update. Snarrlygribbly rewrote the code to work in P10/PP2014 and released the script as Particles 3+. It seemed no one besides myself and a couple of testers used the script and it was not updated to work in P10. The script still works but the Life nodes need a material rework as they no longer function correctly under the new Poser. Particles 3+ is still freely available but Royston will not be updating it. Like Cybermonk mentioned; you could use Blender but will still have to deal with making the materials and I don't know if Blender has a lifespan to their particles. I have never used that function in Blender.