Concepts and projects worth preserving: a long list.

Trefle

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An API to data about plants. Trefle API Docs

It made it to a second major release, which involved breaking changes, and another cleanup release 6 mo. after that. It was popular with students and enthusiasts, enough so that they had to rate limit people to ~2 reqs/second. They harmonized data from a number of sources, public and private.

They had a quet discord with 100+ members. After 6 mo of no updates the API died on 5/2/20; they stopped by discord on 5/3/20 to say "goodbye and thanks for all the fish", took no questions, never returned.