Do any you use any sort of email asset management system

We're often asked by several parts of our business if they can see all of the emails we have available in Marketo.  Many of them don't have seats in Marketo.  And even they did, Marketo really doesn't offer a scaleable/searchable way to view emails (across multiple workspaces).  The ideal system would allow us to upload every email that we produce - and tag it appropriately so that it can be easily searched (by campaign, by topic, by offering, etc.).  Aside from a full featured digital asset management (DAM) platform, does a cost-effective platform focused solely on email even exist?  I realize email archiving platforms are available.  But this is different.