This project was started two years ago in Novosibirsk State University Hackspace when we prepared soldering lessons.
So, we try to design hackable board you can assemble using one soldering iron. We use through-hole components wherever it is appropriate so board is easy to assemble and to modify. In comparison with Freeduino TH, our board has USB-UART converter and it is compatible with Arduino UNO.
USB-UART chip we use is CH340G (as in Chinese boards) because of it is easy to solder (in comparison with FT232) and cheaper for sure.
Free space we use as 7x11 holes prototype board. This way you can do small experiments even without breadboard.
Design files available on GitHub
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