RANCID monitors a router's (or more generally a device's) configuration, including software and hardware (cards, serial numbers, etc) and uses CVS (Concurrent Version System), Subversion or Git to maintain history of changes.
Rancid currently supports Allied Telesis switches running AW+, Cisco routers, Juniper routers, Catalyst switches, Foundry switches (now Brocade), Redback NASs, ADC EZT3 muxes, MRTd (and thus likely IRRd), Alteon switches, and HP Procurve switches and a host of others.
Huhu xD
Bouhhh les copieurs de Haruhi :D
Y en a des bonnes. Ma favorite bien sur :

Oxidized is a network device configuration backup tool. It's a RANCID replacement!
Light and extensible, Oxidized supports more than 115 operating system types.
DO WANT.
directory2rss is a small tool that generates an RSS feed from Apache and nginx index pages to notify about changes. It sets up a small webserver that takes the target URL as parameter and returns the generated RSS feed.
Via river.