PCB forums for discussing and transferring knowledge under various topics Signal integrity(SI),Electro magnetic Interference(EMI) and many more:

Si-list Forums:

Si-list is a signal integrity mail list intended for the interchange of technical information amongst members of the Si community in both industry and academia around the world.

Physics Forums:

Physics forum is for both professionals and students. It is a beautiful example of people coming together to discuss serious issues and topics regarding physics in theory, practice, study and reality with no monetary gain. Students can also find help for homework and career perspectives

Weee Forums:

The WEEE Forum(waste electrical and electronic equipment) is a European association of 39 electrical and electronic waste collection and recovery systems. The WEEE Forum also seeks to be a centre of competence that allows members to make constructive contributions to the general debate on e-waste policy matters.

EMA Design Automation:

By bringing together the tools from Cadence and Autodesk which are two market leaders, EMA provides a single source for all of the design software needs.