Contact Form 7 is a really powerful wordpress plugin that is available free of charge. It not only allows you to build regular feedback forms but also it is quite easy to improve by adding another helpful extensions that were designed specifically for such purposes.
Today we have collected a list of valuable extensions and addons that effectively contribute to Contact Form 7.
1. Contact Form 7 itself with lots of essential features for building a basic contact form.
Extensions
2. Contact Form 7 Integrations – database, analytics and software integration 
3. Component for integrating email marketing by adding users to mail list with a help of regular contact form 
4. Set your own styles with these pack of custom skins 
5. Campaign Monitor Addon – allows you to add newsletter capabilities 
6. SalesKing CRM Addon – move your data from contact form into CRM 
7. Extension for adding affiliates possibilities 
8. Add to you contact form a select box editor button 
10. jQuery Validation for Contact Form 7 
11. Addon allows you to add various integral modules for extending possibilities of Contact Form 7 
12. Dynamic text extension for better cooperation with text fields 
13. Create a multi-steps forms based on a contact form 7 
14. The component makes available a 3-d party integration 
15. Building sleek charts with contact form 7 
17. Honeypot is aimed to add anti-spam functionality 
18. UI generate a shortcode for contact form 
19. A basic Phone Module for contact form 
20. Map Field with coordinates markers for users
