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Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
Dataset Search - Making it easier to discover datasets. Made by Google.
Devhints - TL;DR for developer documentation
Gigadata - Gigadata makes large datasets like total stock market prices, crypto, news, financials, reddit posts, government stats, the weather available via a simple API.
OpenGraph.xyz - Check how search engines and social medias such as Google, Facebook, Twitter display your website
London Datastore - Datastore, dashboard and API for London's data