What I'm looking for is something similar to this ASP.net Ajax Control.
However, I need a solution that uses only free technologies (e.g. PHP, Javascript).
What I'm looking for is something similar to this ASP.net Ajax Control.
However, I need a solution that uses only free technologies (e.g. PHP, Javascript).
Have you checked CKEditor (ex FCKEditor). This is one of the most powerful editors. But it depends what your end users are. If they're developers then consider something similar that SO uses (WMD Editor). Much easier and faster to use. SO guys actually changed it to some degree but the original was used at first.
Basically you don't need it to tie to any server-side technology as long as it's programmable on the client side.