Instructables is a place that lets you explore, document, and share your creations.
HowToMechatronics is an education website in the area of Mechanical, Electrical and Computer Engineering. Tutorials, Tips, Tricks, How It Works, Projects, Examples, Source Codes, Download files and much more can be found here.
NevonProjects provides the widest list of mini projects for mechanical engineering topics and ideas for students, researchers and engineers at low cost.
ARDUINO
Tinkercad is a free online collection of software tools that help people all over the world think, create and make. We’re the ideal introduction toAutodesk, the leader in 3D design, engineering and entertainment software.