Genius idea. I try to donate to open source software I've used for long time, especially if I cannot contribute any code back. This site seems to automate the process of finding out which dependencies of your software are accepting donations.
Unfortunately, I cannot use this right now, because Maven dependencies can't seem to be found, and neither can Cargo dependencies. I decided to test it with an app that uses a mix of ClojureScript and Rust. There is a shadow-cljs.edn file at the root level of the folder, but those dependencies are not picked up. Neither are stuff in a package-lock.json. There is a Cargo.lock file in a subfolder, but that does not seem to be scanned either.
However, I am able to verify there exist dependencies, in each of these files, that are actively seeking for funding and use GitHub sponsors.