Here are some of the most useful sites I’ve found for Arduino related projects and tutorials.
Fritzing – visualize your hardware AKA prototyping software! I use this for all the circuit diagrams on this site.
MegunoLink – MegunoLink is a free tool for talking to any microcontrollers (or any serial device for that matter).
If you have any you really like I’d be happy to include them. If any of my links are out of date please let me know. I don’t always check them.
Hey, I’ve got another pretty barebones serial logger/plotter available. Doest appear to be as full featured as megunolink but does do some FFT magic.
Cheers for the mention. Would love to hear any feature requests/bug reports from your audience.