(If you want, I can produce a ready-to-import After Effects multilayer glow preset or an EXR compositing node setup for Natron/Blender.)
A: This is for After Effects. Resolve has a superior native "Glow" effect, but for AE users in 2021, stacking native effects is the king of free. deep+glow+after+effects+plugin+free+2021
Deep Glow's feature set is designed for professional compositing and motion design: (If you want, I can produce a ready-to-import
: Allows for complex color gradients and multi-tone glow effects. Downsampling & Quality Control (If you want
You can download a trial version from aescripts + aeplugins or the Plugin Everything website . Note that trial versions typically render with a watermark until a license is purchased.