Zuul (https://zuul-ci.org/ https://zuul-ci.org/) is an open source CI/CD system that does speculative execution of CI on changes across multiple repos. So if yo

Zuul (https://zuul-ci.org/ https://zuul-ci.org/) is an open source CI/CD system that does speculative execution of CI on changes across multiple repos. So if you have a change in one repo that depends on a change in another, you can test both together before merging either (and it enforces merging in the correct order). IME it solves the same problem that monorepos are intended to solve, but without any of the downsides.