https://aescripts.com/handy-particles-pro/

Create a unique particle system for your motion design. You can export particles directly from your After Effects projects to Rive. Whether you’re creating dynamic particle effects from basic shapes like ellipses and stars or diving into custom shapes, Handy Particles has you covered. With extensive control over size, movement, burst effects (explosions, implosions), many effects and color customization, this tool offers a unique approach to particle animations.