Stefano Garuti

As you know WordPress’s Registration Form is only displayed in it’s own page, and if you want to invite a user to register, the only option you have is to provide a link to the registration page. 
With this plugin you have a new widget that insert a Registration form in your sidebar. 
The new registration form supports all the hooks that the standard Registration page does, so you can use it safely even with other plugins like Registration Plus that add fields to the form.
UPDATE and NEWS at: http://www.wpmania.it/registration-widget/

Registration Widget

This plugin provides you with a new Widget that inserts the Registration Form in your sidebar (or wherever a widget-area is defined in your theme).

TotalSuite

<h3>TotalForm WordPress Form Plugin</h3>
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Export your results in any format that can serve your purpose to create further decisions based on the results.
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Contact Form by TotalForm – Next-gen Form Builder for WordPress

TotalForm is the next-gen form solution for WordPress. Contact form, registration form, order form, you name it.

Registration Widget vs Contact Form by TotalForm – Next-gen Form Builder for WordPress