Visual PlanIt is a set of synchronized, data-aware components for
adding time, task, & contact management capabilities to applications
written in Borland Delphi & C++Builder. Get that Outlook look & feel
without the hassle.
A Lazarus (LCL) version is available too. On SourceForge, in the "Lazarus Code and Components Repository" [sourceforge.net/projects/lazarus-ccr/] there is a ported and more maintained version that the old one found here. SF.net really should allow projects to be linked or marked as related is some way.
Thank you for your work.