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http://www.caddsoftsolutions.com/  – Very useful site to fulfil your needs for CAD Customization,Developement and training.

http://prashantsharma.org/- you will find all the professional details about Prashat sharma, an experienced mechanical engineer.

http://www.roymech.co.uk/ - The site provides convenient access to data for design engineers and engineering draughtsmen.

http://www.efunda.com/home.cfm - You can quickly find concise and reliable information to meet the majority of their daily reference needs.

http://www.engineeringtoolbox.com/ - Resources, Tools and Basic Information for Engineering and Design of Technical Applications.