Eclipse Foundation Member
Spring Tool Suite (STS) for Eclipse Juno (3.8 + 4.2) 3.6.3.RELEASE

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I encountered the same problem.Reporting this message :

Unable to read repository at http://download.eclipse.org/technology/m2e/releases/1.3/1.3.1.20130219-1....
Connection reset

It has a download problem as follows in market place. please check the site.

An error occurred while collecting items to be installed
session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to read repository at http://download.eclipse.org/technology/m2e/releases/1.3/1.3.1.20130219-1....
Connection reset
Unable to read repository at http://download.eclipse.org/technology/m2e/releases/1.3/1.3.1.20130219-1....
Connection reset

STS is currently IMHO the best Eclipse distribution, that come with the latest Maven.
It also comes as based on Eclipse 4.2 or Eclipse 3.8. The second being more responsive and quicker.
It is the only distribution (that I know) that has Eclipse 3.8 option.