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Patchman is a django-based patch status monitoring tool for linux systems.

Patchman clients send a list of installed packages and enabled repositories to the patchman server. The patchman server (CLI or web) updates it's package list for each repository and tells the user which hosts require updates, whether those updates are normal or security updates, and shows installed packages that are not part of any repository. Hosts, packages, repositories and operating systems can all be filtered (using features or arbitrary tags). For example, you can find out which hosts have a certain version of a package installed, and which repository it comes from.

Patchman does not (yet!) have the ability to update packages on hosts, although it is possible to use a yum or apt plugin to send a report to the patchman server every time changes are made to packages installed on a system. There are plans for a module for patchman<->puppet integration to allow remote installation of packages.