The best alternatives to PiTanq are Raspberry Pi, Kite, and Tingbot. If these 3 options don't work for you, we've listed a few more alternatives below.
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The Raspberry Pi is a series of small single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote teaching of basic computer science in schools and in developing countries.
Kite is a DIY kit of electronic components. You can now build a smartphone with your own hands! A KitePhone (i.e. a phone built with Kite) is a powerful Android smartphone that offers a surreal Android experience. It is not a fixed phone - it's configurable in every way. The "case" is 3D printed. And you can change anything.. your lifestyle too!