Calendar/Tasks alternative that doesn't take over contacts

[mindfrost82]

I'm looking for a program that manages the Calendar and Tasks but doesn't replace the default Contacts app.

For the Q, I used Papyrus and loved it, but its only for the smartphone, no PPC version.

I tried Pocket Informant and didn't really like it, plus it replaced my Contacts app.

Is there something out there like this?

I looked at AgendaOne and AgendaFusion and they both look like they replace the Contacts.