MailPace - A Transactional Email Provider from the creators of idbloc.co - for apps, websites and anything else
Shorten.REST - A URL shortener API you can depend on
Swink - Short links with stats and automatically branded QR codes
Pixela - Record and Track your habits or effort. All by API.
Maizzle - Quickly build HTML emails with utility-first CSS.
Cutt.ly - Free custom URL Shortener and branded URLs with advanced links tracking and Link Management Platform & API.