paperplaneCMS for Mac OS X is a project run by volunteers, so if you want it to improve, volunteer!
If you want to download and install the complete source code (php) to start hacking on Git for Windows itself, Please read install ppCMS to get detailed information.
All featured downloads are also linked from the sidebar on the left.
More information:
How to install ppCMS or update ppCMS Future plans ppCMS-Lion The archives of the ppCMS Edwardo
How to get help
First, install ppCMS.dmg. No worry, this is easier than you think. Downloading and executing it will give you a working development cms environment and automatically are configure during your installation via real time on your browser, just folow instruction and click next!