For the most part the code between the OSs is the same, but there are differences between them that must be addressed. File location, permission issues, TTS differences and just general window and button differences must be dealt with.
The Windows edition is nearly ready and when released i'll start working on Mac and Linux. One issue with Linux I have found is a key requirement for Bible Analyzer is only in the very latest Ubuntu repository, i.e. 14.10. That will be OK for users of that version and newer, but the latest repository for Mint 17 is 14.04 and those users won't be able to run it. I may have to package the dependencies with the app but then i don't know if I can get it in the Ubuntu Software Center.
There are always problems.
Developer, Bible Analyzer
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. (Rom 4:5 AV)