D8: Maintaining a canonical path and redirecting alternative URL's like non-aliased path, path without language prefixes and so on (Previously provided by Global redirect)
D8: Separate Redirect 404 module that logs aggregated 404 request (can suppress them in the default log) and allows to create redirects from them
D8: Separate Redirect Domain module allows wildcard and domain redirects
Allows users and visitors of a Drupal site to quickly send feedback messages about the currently displayed page, using a fixed positioned and ajaxified feedback form.
Mailhandler uses Feeds to let you post nodes by email. It takes mail (usually from an IMAP mailbox) and imports it as whatever type of content you choose. Plug-in modules allow you to do more awesome things like post comments, select different authentication methods, and set properties such as published / sticky status using "commands". Hugely powerful and flexible, but includes a "quick-start" module to help get you started.
A module that lets you track CVS commit messages. You can see it in action at http://drupal.org/cvs. Interfaces with the project module to make releases via specific CVS branches and tags, and provides per-project source code access control.