What now to me seems like eons back I was part of a team that released the first software cost estimation tool based on COCOMO for the hand-held. It was called C.A.S.E (as it was a computer aided software estimation tool as well as CoCoMo II Application for Software Cost Estimation).
As the software was developed as part of a software engineering course that I took under Dr. Joel Henry we branded the software under the University of Montana logo.
The software is still available for purchase from Handango: Cocomo II Application for Software Cost Estimation (C.A.S.E) by Dr. Joel Henry - Handango Pocket PC Software
The application was written in what was called eMbedded Visual Basic a pre-cursor to the now mature development tools for the PocketPC platform. This version had almost no concept of encapsulation and object oriented development and hence we had to come up with some weird implementation mechanisms that allowed us to leverage OO concepts (one of which was to create separate forms - each form representing one class). Some day when I have the time - I would like to see what it would take to port the code over to .NET CF.