Bizness Apps - Create your own app or become a reseller and build apps for others
B4J - 100% free development tool for cross platform desktop and server apps.
GoodBarber - GoodBarber is a mobile app creation platform.
NotePlan - Make plans inside an individual markdown note for every day in your calendar. Use it as a journal for your daily tasks and plan todos in advance. For Mac, iPhone and iPad.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
Xojo - Real Software and Real Studio are now Xojo.