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StrongMail - email server & deliverability
FogBugz - bug tracking
ScrewTurn Wiki - (free) internal wiki for dev team (we're a .NET shop; YMMV)
ZenDesk - support help info/knowledge base
RightNow - support ticketing and chat
Google Analytics - for broad technical analysis of our users
Leads360 - we (well, our sales ppl) use our own product for CRM/lead management
--------
StrongMail - email server & deliverability
FogBugz - bug tracking
ScrewTurn Wiki - (free) internal wiki for dev team (we're a .NET shop; YMMV)
ZenDesk - support help info/knowledge base
RightNow - support ticketing and chat
Google Analytics - for broad technical analysis of our users
Leads360 - we (well, our sales ppl) use our own product for CRM/lead management