Add-on control with "edit" capabilities

I want to add some different controls on my web page that have "edit"
capabilities. This would be like a portal starter kit module where, if
authenticated, the user could click an edit button to change the text, add a
document, etc.

Besides using a full blow starter kit/platform, does anyone know of some
add-on components that I could just add to my existing page(s)?

Thanks.

Amil


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