Sharetronix is described as 'Secure Social Network for Your Company. Collaborate with Your Coworkers, Clients, and Partners' and is an app in the Social & Communications category. There are five alternatives to Sharetronix for a variety of platforms, including Self-Hosted solutions, PHP, Linux, Online / Web-based and BSD. The best alternative is Friendica, which is both free and Open Source. Other great apps like Sharetronix are Open Source Social Network ( OSSN ) (Free, Open Source), Oxwall (Paid), SocialEngine (Paid) and phpFox (Paid).
Friendica is a distributed social network application. Which allow users to connect with others via their own Friendica server, but may also fully integrate contacts from other platforms including Twitter, diaspora*, Pump.io and StatusNet into their 'newsfeed'.
opensource-socialnetwork also know as OSSN is a social networking software written in PHP. It allows you to make a social networking website, helps your members build social relationships with people who share similar professional or personal interests.
SocialEngine is a PHP-based white label social network platform. Advanced social networking features include blogs, photo albums, user groups and forums, providing complete control over the layout and functionality of your social network, community, or portal.