rConfig is a network device configuration management utility for network engineers to take frequent configuration snapshots of their network devices. It lets you choose which commands you want to run against your devices. Simply configure rConfig with the list of commands you wish to apply to a category of devices, and add devices to the category. Create a scheduled task, and rConfig will do the rest.
Archivist is a network device configuration archiving and versioning program. It uses Subversion as its revision control system. Its multithreaded design makes it quite fast and thus suitable for operation on large networks with thousands of network devices. It supports Cisco IOS, Cisco CatOS, Juniper JUNOS, and Brocade/Foundry MLX series, but it can be easily extended to support any SSH or telnet-based network device by creating your own config download and post-processing scripts.