Netpict

is a free network diagram tool developed for students, teachers, and anyone else who might find it useful.

Create network diagrams using popular Cisco icons.
Save network diagrams to share with other Netpict users (.vnm extension, can be attached in our forums))
Export network diagrams to image format (png, jpg, gif, bmp)
Crop image exports to a suitable size for forum posts
Discover network devices automatically using traceroute, ping subnet