Paid
Ionic
Create cross-platform mobile and desktop apps
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The MongoDB Database
Pixel art sprite editor
Lightweight IDE software
Build cross platform desktop apps with JavaScript, HTML, and CSS
Twine: Create Non-Linear Stories Easily
Compile Arduino Sketches with Arduino Builder
A Microsoft Development Platform to Install and Run Apps in .NET Framework
Delta3D Software Overview
Open-source engine for 3D games
Sandbox Free Game Maker: Easy 3D World Design Tool
Solar2D Development Engine Overview
Solarus: A Zelda-Style Game Creation Tool