If you don't know where to start, I suggest you to try Lumen, is a PHP framework to easily make API. - Source: Reddit / 6 days ago
Slim - A PHP micro framework
RunGap - Free Workout Data Manager for iOS.
Laravel - A PHP Framework For Web Artisans
Trails - Trails is a web application framework for Node.js.
Leaf - Plug-n'-plant automatic cannabis home grow system
tapiriik - Automatically synchronize your fitness activities between Garmin Connect, Runkeeper, Strava and more.