postActiv is described as 'Free and open source social networking project based on GNU Social. It uses OStatus, which means that users can for example connect to users on Mastodon and GNU Social instances as well' and is a Microblog in the social & communications category. There are seven alternatives to postActiv for a variety of platforms, including Web-based, Self-Hosted, Android Tablet, Android and iPhone apps. The best postActiv alternative is Mastodon, which is both free and Open Source. Other great apps like postActiv are Pleroma, Friendica, VK and GNU social.
Decentralized and federated social platform with no ads, focusing on personal interaction, and offering 500 character posts, custom emojis, content warnings, and robust moderation tools.
Germany
EU
Pleroma is a free, federated social networking server built on open protocols. It is compatible with GNU Social, Mastodon, and many other ActivityPub and OStatus implementations.
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'.
Australia
VK (originally VKontakte) is a largest social network service from Europe. Available in many languages and highly popular particularly among Russian-speaking users around the world, especially in Russia, Ukraine, Kazakhstan, Moldova, Belarus, and Israel.
Russia
GNU social is a continuation of the StatusNet project. It is social communication software for both public and private communications. It is widely supported and has a large userbase.
United States
This is a fork of Pleroma, which is a microblogging server software that can federate (= exchange messages with) other servers that support ActivityPub. What that means is that you can host a server for yourself or your friends and stay in control of your online identity, but...
identi.ca is a free personal web server that implements a distributed social networking service. It is based on pump.io, a free software which make up the distributed social network.
Canada
