IntelliJ IDEA - Capable and Ergonomic IDE for JVM
Bizness Apps - Create your own app or become a reseller and build apps for others
Microsoft Visual Studio - Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
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!
Eclipse - Eclipse is an open source community, whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes for building, deploying and managing software across the lifecycle.
Dropsource - Mobile development platform for building native iOS & Android apps