The best IDE alternative to RPG Maker is GDevelop, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to RPG Maker and four of them are IDEs so hopefully you can find a suitable replacement. Other interesting IDE alternatives to RPG Maker are Phaser Editor, Visionaire Studio and Project Anarchy.
GDevelop is an open-source game making software designed to be used by everyone. Any kind of 2D games can be created with it and no programming skills are required to get started. Logic of games are made using visual events.
Phaser Editor is a tool for HTML5 games creation. It provides several built-in editors for texture packing, JavaScript coding, Assets management, and 2D level building.
Visionaire Studio is the top reference for the development of adventure games.
Project Anarchy is a complete end to end game engine and state-of-the-art toolset for mobile. Project Anarchy includes an entirely free license to ship your game on iOS, Android and Tizen platforms.
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While GDevelop has a lot of great features, it really isn't very similar to RPG Maker at all. The games you make for GDevelop are more like games you would play on your phone rather than actual RPGs.