"Rietveld starts off with major geek cred because its
primary author is Python's Guido van Rossum. The tool is written in
Python (of course!) and hosted on Google's own experimental
cloud-computing framework AppEngine. Anyone with a Google account
can participate; after logging in you can identify Subversion
repositories and branches containing code that needs to be
reviewed, upload changed source code files, and invite reviewers.
Reviewers can see an online diff and leave their own comments, and
the system uses email notifications to keep the discussion moving
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