Daum Equation is a free Google Chrome app WYSIWYG equation editor. The application generates tex code that you can save and reuse later, and the mathematical expressions created can also be saved as pictures. In addition, Daum supports text input, task history, as well as copy and paste. Watch the (voiceless?) video below to see how it works. » Read more
If you are doing a lot of Latex coding (writing math equations on the web), you may want to check out CodeCogs.com , an excellent WYSIWYG online Latex editor and generator. In CodeCogs, you can write mathematical symbols by simply clicking on symbol buttons, and the Latex code is automatically generated. Codecogs supports colored Latex, multiple fonts and font sizes as well as transparent and colored backgrounds.
The site also provides embed codes for HTML, URL , TiddlyWiki, WordPress, and phpBB.