[Zope] What do you use for document management?

I need to implement/acquire a document management system (for chip engineering docs) that works well with Zope. I have no experience in the field of DMS, so can someone point me in a good direction. I know there are humongous packages available for megabucks, but my company is not in a position to pay for one of those. I'm hoping for a more modest solution both in scope and cost -- would OpenSource be too much to hope for? -- Loren