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The only I can think of is the Jacoco one, also core Gradle. But it probably has the same internal complexity. Variants are really powerful for this but also quite complex to leverage for now. If you find some, please point them out. Would be interesting to see what kind of APIs Gradle should provide to make their implementation easier.

I think @Jendrik Johannes has one and @Zak Taccardi was playing with that concept too but not sure if his projects are open source

This is what I have and I think this is kind of a minimal example (+ I have some explanation 🙂 ) https://github.com/jjohannes/understanding-gradle/tree/main/13_Aggregating_Custom_Artifacts