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2-Speed Manual Transmission Working Model
Controlling Direction and Speed of DC Motor Using Raspberry Pi
Hi. You may want to include http://geargenerator.com. Altough it's not a design software is a very neat tool for generatin gear train online.
How to build an electric Longboard with phone control
How to Make a Mini Compressed Air Turbine
BeamBox - A tower that glows to your commands
Beginners Guide to Connecting Your RC Plane Electronic Parts
Battery Powered Hovercraft
Inexpensive, easy to build, peristaltic pump
Web Controlled 8-Channel Powerstrip
DIY Arduino Remote Control and Lego RC Vehicle!!
Self-balancing skateboard/segw*y project Arduino Shield
Mini Arduino environment monitor ** UPDATE - Added RTC ***
DIY Muscle Sensor / EMG Circuit for a Microcontroller
Cheap, Sturdy, 1-Hour Quadcopter
BoB the BiPed
Android talks to Arduino
Simple RC car for beginners (Android control over Bluetooth)
Arduino - Control DC Motor via Bluetooth
Capacitive Touch Arduino Lamp
Control Servos over the Internet via Arduino with Teleduino