MathType 5.2 is a popular equation editor developed by Design Science, Inc. It's widely used in various applications, including Microsoft Office, Google Docs, and more.
If you are publishing equations to the web, MathJax is an open-source JavaScript display engine that renders LaTeX or MathML cleanly across all modern browsers. mathtype 5.2 registration key
Tools like LibreMath are completely free. They let you write equations without paying any money. MathType 5
Superior typesetting quality, entirely text-based, and highly stable. including Microsoft Office