There's a new plugin for Gentoo Build Publisher available: gbp-fl. Think of it as e-file or equery files but instead it indexes files from binary packages on Gentoo Build Publisher. For example:
But more than that it can also fetch the binpkgs without having to go through portage:
More features to follow, including grabbing individual files from packages, stats on builds and machines, a GBP dashboard and more.
This is both a plugin for GBP server and the GBP cli. One of these days I'll do a write-up on how to write GBP plugins.
More information about gbp-fl can be found on the project homepage.