NinjaCal: Dev The Dev License permits world-wide multi-site distribution of NinjaCal tightly integrated into your own solution. (In contrast to the Site / Pro version which is sold as singe site licenses.) See our Licensing Page for more information. The ProDev Version shares the same features as the Pro Version of NinjaCal. You can rely on our online documentation for answers to common integration and modification questions, or look to our online forums for questions and answers posted by other NinjaCal users. Click here for screenshots.