pt_AutoExpress: wiggle, smooth, and loop

While not new, pt_AutoExpress by Paul Tuersley is new to AEscripts: "This script can be used to automatically add wiggle, smooth and loop expressions to any selected properties."

Looping and snow particle systems too

Red Giant has a new After Effects video tutorial, Creating a Looping Particle System (episode 3), that uses both Trapcode Particular and Starglow to create a looping, stylized holiday snowstorm. Host Aharon Rabinowitz already did a looping particles tutorial at Creative Cow (with built-in CC Particle System II), but this apparently goes deeper.

In the same vein, Motionworks has a free project Particular: Snowflakes, and in Layers TV: Episode 67 guest Jason Scrivner demonstrates for beginners how to create falling snow flakes with Particle Playground.