Free, local tools for narrated explainer videos? (like explainroo)

I've been using explainroo to make short narrated explainer videos. It runs fully local: Kokoro for the voice, Whisper for word timing, headless Chrome to draw the frames, and ffmpeg to put it together. No API keys needed.

It works and I like it but it's very simple. After a few videos everything starts to look the same.

Anyone know other free, local options in this space?

Tools, pipelines, or your own setups all welcome. Thanks.