Technology towns in the Boston area?

I'm checking in where most techinology companies are located. I know Silicon Valley, CA is the most famous one but recently, more are actually located in the Northeast and MidAtlantic areas like Reston, VA. And a lot are in the Boston area, MA I hear. Where are they exactly located in the Boston area?... show more I'm checking in where most techinology companies are located.

I know Silicon Valley, CA is the most famous one but recently, more are actually located in the Northeast and MidAtlantic areas like Reston, VA.

And a lot are in the Boston area, MA I hear. Where are they exactly located in the Boston area? Which town?
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