MathType is described as «powerful interactive equation editor for Windows and Macintosh that lets you create mathematical notation for word processing, web pages, desktop publishing, presentations, elearning, and for TeX, LaTeX, and MathML documents» and is a LaTeX Editor in the education & reference category. There are more than 25 alternatives to MathType for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPhone. The best alternative is LibreOffice — Math, which is both free and Open Source. Other great apps like MathType are Overleaf, fxSolver, AxMath and TexMaths.MathType alternatives are mainly LaTeX Editors but may also be Calculators or Digital Painting Tools. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of MathType.