Open source customer database/scheduling program

I'm looking for an open source program that does the following:

-Customer database with several fields and flags (preferrably customizable, ex. a flag to show when a customer is not up-to-date on payments. This flag will be manually set by the user)
-Scheduling of customer appointments with logical calendar display
-Web based

Does anyone have any ideas? Thanks in advance.
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LocoTechCJConnect With a Mentor Commented:
Here is a great reviews of some of the top open source products for managing customers and some include scheduling features.  You're sure to find what you need.

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