Wikipedia
MathMagic
MathMagic is a mathematical WYSIWYG equation editor, available for Windows, Mac OS X, Android and iOS since its debut in 1998. MathMagic is known for its DTP quality equations and widely used by Adobe InDesign and QuarkXPress users. MathMagic is a stand-alone multi-purpose equation editor application so its equation can be used by most software, such as word processors, presentation software, DTP layout software, and graphic software, via Copy and Paste, Drag and Drop, or by exporting to one of its supported formats.