RubyMine - Cross-platform IDE for productive Ruby & Rails development.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
IntelliJ IDEA - Capable and Ergonomic IDE for JVM
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
MasterControl - Life Changing Products, Flawlessly Manufactured.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.