Mojo was originally an open source project for World of Warcraft (WoW). That program was never finished. It was abandoned in January 2010.
A few years later, work began on a new program with the same name for Dark Age of Camelot (DAOC). This new Mojo is not open source.
Old Mojo is still available. You can download both its executable and source code for free.
Old Mojo and new Mojo are different programs but they have the same name. If you install both on your computer, one of them will appear as "Mojo 1" in your start menu. To avoid confusion, you may want to rename the shortcuts.