Developers of several Twitter clients are now shifting their focus to another upstart platform: Mastodon. Tapbots, the company behind Tweebot, published Ivory, a Mastodon client based on their long-running Twitter programme, this week. Matteo Villa, the creator of the Twitter app Fenix, is testing his own Mastodon client called Wooly. Junyu Kuang, the independent developer behind Twitter client Spring, is developing Mona, a Mastodon software. Shihab Mehboob, the creator of the Twitter app Aviary, is close to releasing Mammoth, a Mastodon client.