MySocialApp - Seamless Social Networking features for your app
Whalebird - Whalebird is a Mastodon client for desktop application.
Manyverse - A social network off the grid
Twidere - Tired of seeing ads and promotions in your timeline, being disrupted by tweets from bots and people...
Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!
Pinafore - An alternative web client for Mastodon, focused on speed and simplicity.