Donations are fantastic but if you have engineering (or project management, design, etc) skills spending just 1 hour a week contributing to their open source goes a very long way!

Open Library in particular has a very active repo with lots of volunteers, a weekly community call, and a rather accessible codebase. https://github.com/internetarchive/openlibrary

If anyone knows webpack well would LOVE to have this dev-facing issue resolve to auto reload CSS https://github.com/internetarchive/openlibrary/issues/4955