Nathan Osman

If you’ve written a question or answer on any Stack Exchange site and you would like to share it with your readers, you are no longer limited to pasting a static link. Instead, StackTack will embed a live widget with the contents of the question and some of the top rated answers.

StackTack

StackTack is a JavaScript widget that displays questions from Stack Exchange sites.

Timo Schiller

Kilomoana

This Plugin allows you to include a simple Textbox through which your site visitors can ask you short questions. 
You can answer them through the backend.
See it in action at: (http://kilo-moana.com/ask-me-wordpress-plugin/)

Ask Me

Great !

Simple Plugin to let your users ask questions.

StackTack vs Ask Me