Twidere - Tired of seeing ads and promotions in your timeline, being disrupted by tweets from bots and people...
Pawoo - Japanese Mastodon client with English translation.
Hyperspace Mastodon client - Hyperspace offers a clean, fast and responsive client for the Mastodon social network
Pinafore - An alternative web client for Mastodon, focused on speed and simplicity.
AndStatus - A client for Twitter, Mastodon, GNU Social and Pump.io
Megalodon - A fork of official Mastodon Android app which include new additional features.