Yoga is a cross-platform layout engine enabling maximum collaboration within your team by implementing an API familiar to many designers and opening it up to developers across different platforms.

Full-stack eCommerce API for developers & designers
We're building a complete eCommerce API for web & mobile.
Starting with our Checkout API.

A crossplatform application API, powering the crossplatform gaming platform RetroArch

Libretro is a simple but powerful development interface that allows for the easy creation of emulators, games and multimedia applications that can plug straight into any libretro-compatible frontend. This development interface is open to others so that they can run these pluggable emulator and game cores also in their own programs or devices.

Background sync is a new web API that lets you defer actions until the user has stable connectivity. This is useful for ensuring that whatever the user wants to send, is actually sent.

APIs for Text Messaging, VoIP & Voice in the Cloud

web and mobile payments system

HTML5 WebSocket Powered Realtime Messaging Service

Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality to web and mobile apps.

Create an API for any website, in any programming language, without writing a line of code

The Smart Proxy is a project which provides a restful API to various sub-systems.

Its goal is to provide API for a higher level orchestration tools (such as Foreman).
The Smart proxy provides an easy way to add or extended existing subsystems and API's.

Currently supported (Click on the links below for more details).
DHCP - ISC DHCP and MS DHCP Servers
DNS - Bind and MS DNS Servers
TFTP - any UNIX based tftp server
Puppet - Any Puppet server from 0.24.x
Puppet CA - Manage certificate signing, cleaning and autosign on a Puppet CA server
BMC - Power management etc