If you are working in an environment that needs to mix between different languages, and a monorepo makes sense for you, then a tool like please let’s you stitch those things together and handles dependencies between those things. So if you have a service defined in an IDL like gRPC or OpenAPI, with a backend in python and a web front-end in JS, and API docs, etc, a tool like this can stitch together changes really efficiently.

Please is a lot more lightweight than Bazel, so it’s easier to get deployed and work with different projects. The new maintainer has been shaving off a lot of warts lately and it’s getting a lot better.

If the above doesn’t describe your situation, then a tool like please, pants, buck, or bazel is probably not for you. And that’s ok too.

Or CMake or the C/C++-oriented http://floooh.github.io/fips/ (a high-level build system "similar to Rust’s Cargo or Javascript’s NPM, but for C/C++ projects.").