JomSocial

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BuddyPress

Yammer is a freemium social network for enterprise collaboration. Yammer provides features that allow organizations to communicate and collaborate privately across teams and departments. Access to Yammer is determine by the user email address and domain, which means that only individuals with approved email addresses may join their respective networks.

Bitrix24 is a social collaboration platform and CRM that is free for small business and subscription-based for enterprises. With Bitrix24 you can create your organizations very own intranet that includes Gantt, Kanban, time tracking, workload planning, and customer relationship management tools.

Elgg is an award-winning open source social networking engine that provides a robust framework on which to build all kinds of social environments, from a campus wide social network for your university, school or college or an internal collaborative platform for your organization through to a brand-building communications tool for your company and its clients.

A next generation user profile and social networking plugin for WordPress. PeepSo allows you to quickly and effortlessly create a social network and online community with you WordPress-powered site. The foundation of PeepSo is 100% free and gives you the basics to create a functional community. For more advanced features, there is a extensions ecosystem for both free and premium plugins that can be used to add more functionality and features to your site.

MemberPress is a premium WordPress plugin that allows you to instantly start charging your users for access to your content. The MemberPress plugin integrates with the most common payment provides and third-party services.

Ultimate Member is a WordPress plugin offers a wide range of features including user profiles, member directories, user registration and login, user role editing, content restriction.