Content Sensitive Help

Could you describe an example of what you're hoping to accomplish?  Because as-written, it seems to me like this could refer to anything, and Appian has a lot of informational display possibilities available right ouf of the box.

For eg : We have a hyperlink of "help" on some websites or pages.Like wise is there any plugin for Content Help

I'm still unclear why you'd need a plugin for that.  In Appian you could make a "help" hyperlink trivially easily, which could do any of a number of things including expanding a previously-hidden section containing various pieces of help info, or alternatively, hyperlinking to an external webpage with advanced help info, using a!safeLink() to open that link in a new browser tab.

To make it "context sensitive" you have 2 options.

You can either make one link, or helpTooltip, or whatever component you choose, and contextually have it direct the user to different help depending upon some condition in an if() statement.

OR

You could simply create multiple links, only showing the relevant one to the user's particular case by using the showWhen parameter of each one.

I agree no plugin is necessary, and to a point I can hardly see how one would be of much benefit beyond what comes out of the box even if it did exist.