LaTeXiT Replacement script is described as ''. There are three alternatives to LaTeXiT Replacement script for a variety of platforms, including Mac, Windows, Microsoft Office Word, Apple iWork and Google Drive - Docs. The best alternative is MathType. It's not free, so if you're looking for a free alternative, you could try KLatexFormula or LaTeXiT.
MathType is a 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.
LaTeXiT is a small utility that allows you to quickly typeset LaTeX equations, without bothering with file creation, preambles, and so on. The PDF image obtained can then be exported by dragn drop to any application supporting it.