List of web based math editors

Since not all of these use MathJax, it's not clear where to put them. But it's a resource worth building.

open source.

• wysiwhat open source, Aloha-plugin, not quite wysiwyg.
• (MathEditor, currently removed, might become open source again)

commercial

• formulasheet.com unclear if available as plugin
• hostmath unclear if available as plugin
• MathFlow MathML only, Java
• mathicando.com MathML only, unclear if available as plugin
• sharemath.com both MathML and TeX, Flash
• Wiris both MathML and TeX, also image output

others

• MathEdit not sure if alive or which license is used.
• Kamma, not sure if alive or which license is used.