What are some alternatives?
When comparing WPMU DEV and Gravity Forms, you can also consider the following products
Pareto Security - Pareto Security is a Wordpress Security plugin
ProntoForms - ProntoForms is a mobile business solutions application, converting paper forms onto any tablet or mobile device.
MAMP - MAMP is the abbreviation for Macintosh, Apache, MySQL, and PHP. It is a reliable application with its four components that allows you to access the local PHP server as well as the database server (SQL).
Forms On Fire - Forms On Fire provides a complete, customizable mobile forms and workflow system that is reliable and secure, works offline or online.
Yoast Plugins - Yoast offers plugins to improve SEO and optimize web sites and blogs.
Jackmail - A newsletter plugin for Wordpress.