EquationMap.com is described as 'Equation Map powered by MathJax' and is an website in the Education & Reference category. There are six alternatives to EquationMap.com, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and BSD. The best alternative is yEd Graph Editor, which is free. Other great sites and apps similar to EquationMap.com are MathType (Paid), KLatexFormula (Free, Open Source), Apache OpenOffice Math (Free, Open Source) and LaTeXiT (Free).
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.
Math, part of the Apache OpenOffice suite, is a tool for creating and editing mathematical equations, similar to Microsoft Equation Editor (included in Microsoft Office). The created equations can then be embedded inside other OpenOffice.
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.