Database Management Add-On For Contact Form 7

Save contact form submissions as leads. The full data from all forms will be saved and accessible in your administration (unless you choose otherwise).
Save and view attachments. Never lose the files sent to you even if your email program has stripped them out.
Exclude forms from saving. You can choose which contact forms to be saved.
Exclude columns / fields from saving. You can choose which fields from each form to be saved. Skip fields with unnecessary data to save space.
Sort and search/filter. The data from all fields is saved individually which lets you search and sort it to easily find those entries that are of major importance to you.
Export data to CSV - the search filters apply to the exported data.
Reports and charts. Run reports and charts on all quantitative fiels. Get useful data insights for your audience, topics, products and services they are interested in.
Automatically subscribe contacts as users to your site - this is of course a configurable option per each form.
Changes to forms in Contact Form 7 are instantly reflected to your database.
Open source code that allows customization.
Localization-ready .pot template file available.
User manual is available here.

And More: