Meet Omega2: an affordable computer with WiFi for your internet of things projects. This hardware development platform is less than 1/4 the size of the Raspberry Pi. It has on-board flash storage and runs apps. The device runs Linux and can be programmed using PHP, Python, C++, and other languages.
The Omega2 comes with the Onion Cloud integrated. It has a modular design and supports Arduino. Omega2 and Omega2 Plus cost you $5 and $9 respectively.