Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to take the step from physical prototyping to actual product.
Fritzing is available for Mac OSX, Linux, Windows and as a source tar ball. If you’re into electronics prototyping you should definitely give it a try.
Guilherme Martins has put together what might be considered as the cheapest, easiest, do it yourself arduino clone: the PAPERduino. Because there’s no direct USB connection you’ll either need a USB TTL-32 cable or an FTDI basic breakout to communicate with the ATMega168.
This is a fully functional version of the Arduino. We eliminated the PCB and use paper and cardboard as support […] This is the the first version of the layout design, next we will try more designs, and another materials. You just need to print the top and the bottom layout, and glue them to any kind of support you want.
If you think an arduino is too much or you simply want to cut costs, then RBBB is the board for you. RBBB boards come in three flavors: as a kit with all the required components, fully assembled or just the board itself.
This is a mini board designed for those experimental applications that require small processors, such as wearable computing, near space experiments, toy prototyping, artist’s projects or any use for a fairly small, low-cost microcontroller. As far as we know, it’s the smallest and most low-cost Arduino-compatible available right now.