1. DatojiA tiny JSON storage service. Create, Read, Update, Delete and Search JSON data.
3. Api.rssRSS as RESTful. This service allows you to transform RSS feed into an awesome API.
4. WebinspectorRuby gem to inspect completely a web page. It scrapes a given URL, and returns you its meta, links, images more.
5. restcountryThis is a Ruby wrapper library around the API provided by REST Countries http://restcountries.eu