People often searches with Open Source DIY Robotic Arm Kit – factually, this is Arduino like odd way of thought. If you can make a scissor to cut a paper with servo motors following a line – that is a robot.
Safe and simple AC PWM Dimmer for arduino Raspberry pi Schematic
3D Printers | scanlime
BITX - A Bidirectional SSB QRP transceiver for homebrewers