Gravity Forms
Gravity Forms was the first-ever premium WordPress data capture form plugin.
RocketGenius
It was founded in 2007 by a development outfit called RocketGenius, led by Carl Hancock.
Since then, they have steadily built out the most advanced and extensible capture platform for WordPress users.
Gravity Forms Add-Ons
Gravity Forms marketplace currently hosts 402 add-ons that extend its capabilities across a variety of useful data capture scenarios, suited to almost any WordPress project.
Gravity Forms Installs
According to BuiltWith, 887,152 WordPress websites are using Gravity Forms.