Kleinanzeigen.de — Germany's biggest classifieds site — has no public API and no category reference. While building AnzeigenBoost, I had to reverse-engineer the full category tree directly from their listing form: 15 top-level, 143 second-level, 476 third-level categories, with numeric IDs for L1/L2 and slug IDs for L3.
I open-sourced it: github.com/Rebaiahmed/anzeigenboost-open (MIT)
Includes a full tree with IDs, a flat names-only version, and a tiny lookup example. If you're building anything against Kleinanzeigen, this should save you the same reverse-engineering work I had to do.
Also open to contributors — categories drift as Kleinanzeigen changes things, PRs welcome to keep it current.
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