Features
The standard form addon in Concrete5 allows you to add:

• Textfields
• Textareas
• Selectboxes
• Checkboxes
• Radiobuttons
• File uploads
• Hiddenfields

Extended Form addon gives you the possibility to add these additional form items:

• TinyMCE textarea
• E-mailaddress (with validation and notification option)
• Date and/or time
• Rating options (jQuery)
• "Other" options for selectboxes, checkboxes and radiobuttons
• Labels for radiobuttons and checkboxes.
• No more tables, all div's!
• Uploaded files are shown as download links in the mail, dashboard and exports.
• Reciptient selector 
  The formfiller can select the recipient through selection.
• Integer

Furthermore you can add the following content to your form:

• Title (heading 4)
• Text (paragraph)
• Horizontal rule
• Empty line (just some space between formfields)
• Fieldset (with optional legend)

More options

• Notification to submitter
  You can send a copy of the notification mail to an emailaddress formfield in the form.
  Confirmation possibility 
• "Other" option
  Selectionboxes, checkboxes and radiobuttons can be expanded with "other" option, which opens a textfield.  
• Send attachment to recipient and/or admin
  You can add an attachment to the the notification mails.  
• Capture loggedin user
• There is also a possibility to capture the loggedin user. 
• Tooltip
  To make this addon complete, you can load a tooltip (jQuery) with each formfield.
• Change the sender to a custom one, filled in by you!
• Google reCaptcha option
• NEW in version 2.0
  • Use of templates are now supported
  • No more inline javascript (at least not so much any more)
  • Smart JS and CSS loader
  • Loads only necessary javascript (TinyMCE, tooltip, date/time) 
  • You can add custom css classes to form and each formfields
  • Added labels to each formfield title
  • Capture PageID
• Drag 'n Drop form elements