registry recovery (system hive)

ReactOS - this linux variant is intended to become microsoft compatible enough to run drivers intended for microsoft. It now runs abiword and some other windows apps.

grc.com, or how to enable newbies to perform limited checks of their own system security.

How to fix NT after a Linux install

Frontpage unix replacement. Also check out WebDAV.

inzider is like lsof

spquery remote patch application (commercial)

BOwall - much like libsafe

Table of software equivalents between windows and linux