I have a Java desktop app that I have been selling using Limelm license system (from WyDay) but low sales, so need to make it a free app. This involves:
Remove the current limelm code.
add a nag screen with link to website for sign up for news etc (all this nag screen and emailer code is in my other free Java app, so can be copied and minor edit of link url etc)
Add routine to email home, on every actual install (to count installs of app).
Make new Windows installer (all files already there, just make new installer) for Win/Mac (can TV my Mac for work). All Java files are in the installer and it does not need to install anything else. (Plus email home, on actual install)
If good rate, there are a couple of minor fixes in the app, but that is extra work if easy to do.
My Java coder has got a job and is not available but might answer emails on it for further work.