Steph Wells

Use any of your Contact Form 7 Forms in your sidebars. You can even style it from the widget options. This will also work with any other shortcodes that only work in posts. Just insert the shortcode (ie [contact-form 1 “Contact form 1”]) in the ‘Contact Form 7 tag’ text field. Leave styling options blank in order to style from your theme’s css.
note: rounded corners do not work in Internet Explorer… Surprise! Get a different browser! 
another note: Use 6 digit hex colors for better results

Contact Form 7 Widget

Use your Contact Form 7 forms and other shortcodes in your sidebars.

Nitroweb

KacperSzarek

It adds multiple file upload capability to Contact Form 7. You may also attach the files to the outgoing email. You will reveive all files in one zip file. It requires ZipArchive() installed and enable in PHP.

Multifile Upload Field for Contact Form 7

This plugin can define the file size limit and can compact the files into one zip file to send by e-mail.

Great plugin, works perfectly

Multiple files upload field addon for Contact Form 7

Contact Form 7 Widget vs Multifile Upload Field for Contact Form 7