tool to wrangle config file changes

Long story short, a really crappy vendor is being shoved down our NOC's throat. They have a horrid CLI (if you can call it that). People don't understand it (it's non-intuitive) and are screwing up things all the time. In the hopes of coping with the madness, some of us are looking to put together some sort of open source configuration management tool, such as RANCID. Any luck with this on non-standard equipment, particularly ones that DO NOT allow you to output something nice and "scriptable" (e.g. Cisco's "show running-config") (If not RANCID, any other suggestions?)