Originaly I was using VB.NET, which is fairly portable (.NET is an MS equivalent of Java; if there is a .NET virtual machine for an OS, it can use anything that targets the framework). However, .NET was a pain to work with, so the tool is being developed in Visual Basic 6. I have no idea if a VB6 exe will run on a mac - unless there is a good emulator, I think it is unlikely.
Source code is available with the download.
I have had only had a couple of hours to work on this the last 3/4 weeks, and I dont expect to have much free time for a couple more weeks due to exams. If anyone has the will and the skill to continue development, please do