Features
1. Free installation
2. Free modification (Custom Fields)
3. reCaptcha Validation
Install
1. Unpack the archive
2. Upload contactform folder example.com/contactform
3. Edit email address, website url, website name in emailer.php.
4. Code to display form:
Example
<iframe style="height:600px;width:100%;border:0px solid #fff" src="contactform/contact.php"></iframe>