There is also minipupper2[1] (I have minipupper1, waiting for version2), v2 has servos feedback (I think this first of kind in cheapest robots space), furthermore all minipupper1 hardware is also open-sourced on github[2], it is expected to be same for v2 version.
[1] https://www.kickstarter.com/projects/336477435/mini-pupper-2...