InstaPart - Build circuit boards faster with parts delivered in <24 hrs
Unheap - A nice repository of jQuery plugins
library.io - Learn electronics and easily create circuit boards online
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SnapEDA Plugins - A turbo boost for circuit board design
Tridiv - Web-based editor for creating 3D shapes in CSS