Electrify - Quick Lightning is a lightning generator for Blender from CGI Forge, aimed at users who want precise control over their lighting. It's flexible, customizable, animatable and procedural, with many parameters and control objects for shaping each lightning object, and you can spawn as many of them as you want.
The add-on includes four lightning types. Simple Lightning has no branches and is shapeable like a bezier curve, with tips that can connect to objects. Branched Lightning adds branches, each driven by a control object, with nine control objects and nine parameters. Random Lightning produces a different shape each time you hit Generate and can attach to objects. LowPoly Lightning is a plane with a node-based material that works like grass planes in games and can be set to always look at a chosen object.
It supports Eevee and Cycles for Blender 2.8 and above, applies its lightning material automatically, offers one-click setup ready to render, and ships with an example file and a 19 page user guide PDF.