TreeLib is a dendrology website with curated high-quality tree photographs for educators, students and lay persons.
It uses Flickr (with their API) as a CDN for images.
The website was originally written in [ Ruby // Sinatra // MySQL // React ] between 2015-2016. It's all hand rolled with "caching" (sort of), SQL, a db client, etc.. It works really well actually, but I've been inspired to rewrite it in Elixir so that it's more maintainable and stable.