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NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.
HivePress - HivePress is a free WordPress plugin that allows you to build any type of directory and listing websites. It's incredibly easy to use and highly customizable.
Crowded Communities - The all-in-one community platform.
WordPress GeoDirectory - Turn your website into a profitable Directory, with our collection of WordPress Plugins. Fully open source, customizable it works with any Theme and the most popular page builders. GeoDirectory is scalable and 100% SEO optimized.
Ning - Ning is the social platform for the worlds interests and passions online.