Custom WordPress plugin / integration

I am using WordPress for the content management of my website, but I also have additional database content which I want to integrate with the site. I want to be able to hook into WordPress’s URL routing so I can serve up content from the second database. I still want to use the WordPress machinery (e.g. page templates) to serve up the other content. For example, I want to map all URLs such as: /names/Alice /names/Bob or tags/Foo to dynamic database content. Other URLs (e.g. permalinks) should be handled by WordPress in the usual way. The project is to either: a) locate a suitable existing WordPress plugin, install and configure it; or b) implement a custom solution (e.g. plugin) to facilitate this behaviour; or c) suggest another strategy for achieving a similar effect Cheers, Lach