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.
For those who are new to Chrome apps, just launch the application from the link above. After installing the app, you can view the app in your Google Chrome browser.