LaTeXML - In brief, latexml is a program, written in Perl, that attempts to faithfully mimic TeX’s behaviour...
NumWorks - The graphing calculator that makes learning math easier.
latex2html - latex2html is a convertor written in Perl that converts LATEX documents to HTML. This way e.g.
Paperspade - Type math easily through just English text!
asciiTeX - asciiTeX is an ASCII equation renderer released under the terms of the GNU General Public License.
Fact Flow - Simple solution to help kids achieve math fluency