Most of the documentation is a snapshot of the old Namesys site (archive.org, 2007-09-29).
There was also a Reiser4 Wiki (archive.org, 2007-07-06) once on pub.namesys.com.
Reiser4 development appears to have stalled and ReiserFS is deprecated and scheduled to be removed from mainline Linux in 2025.
Search results
From Reiser4 FS Wiki
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8 KB (1,207 words) - 19:58, 2 July 2009
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32 KB (5,241 words) - 19:41, 25 December 2016
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3 KB (319 words) - 11:33, 10 February 2010
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3 KB (384 words) - 18:12, 3 February 2015
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11 KB (1,776 words) - 19:25, 10 December 2020