Construct Classic - Construct Classic is a free, DirectX 9 game creator for Windows, designed for 2D games.
Bizness Apps - Create your own app or become a reseller and build apps for others
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
Siberian CMS - Siberian is an Open-Source and Free App Maker. Unlimited Push Notifications. Unlimited features. Fully Customizable. Download it and build your own app now!
RPGBoss - Cross-platform 2D role playing game maker.
Dropsource - Mobile development platform for building native iOS & Android apps