Arch Revision Browsers
An arch browser can work in two ways: 1) by browsing an archive directly, or 2) by browsing a revision library.
Archive browsers
ViewARCH builds on ViewCVS and has the virtue of working in text-only browsers like links and w3m. Check out this ViewARCH demo.
Library browsers
PAB: the Platformis Arch Browser
(These, particularly the latter, may have fallen out of date with regards to the archive format.)