[abiro]

I like what Material for Mkdocs did as well. They ship features to sponsors first and release for free when a certain founding goal is met:

https://squidfunk.github.io/mkdocs-material/insiders/

Roughly 10xed their sponsorship revenue in ~1 year.

[squidfunk]

Maintainer of Material for MkDocs here. Correct! The Sponsorware strategy is an alternative to dual-licensing which works fairly well for our project. If you have a successful Open Source project that is a pain killer and product-market fit, this strategy might also work for your project.