MathToWeb is a free, open source, cross-platform authoring tool (GNU GPL) that converts mathematical expressions written in AMS-Latex to presentation MathML. It can be applied either to single equations or entire documents containing numerous equations.

MathToWeb is available __Online__ as well as in
Command-line and Graphical (GUI) format.

With the online variant, LaTeX can be pasted directly into a text editor (or typed in manually) and converted directly. The generated MathML is displayed in a separate text-area where is can be copied and used for its intended purpose. In addition, the MathML is rendered in a frame to the right of the conversion applet, which allows for the immediate visual evaluation of any particular LaTeX->MathML conversion.