Serializer.io - A compact news reader for HN, Product Hunt and more
Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
Web Designer News - Curated stories for designers
Devhints - TL;DR for developer documentation
The Latest - Automatic list of the latest & greatest links from Twitter
OpenGraph.xyz - Check how search engines and social medias such as Google, Facebook, Twitter display your website