Tusky is described as 'Lightweight Android client for decentralized social networking, featuring material design, support for photo, video, emoji, lists, drafts, notifications, multiple themes and timelines' and is a popular Mastodon Client in the social & communications category. There are more than 50 alternatives to Tusky for a variety of platforms, including Android, iPhone, Mac, iPad and Linux apps. The best Tusky alternative is Fedilab, which is both free and Open Source. Other great apps like Tusky are Moshidon, Phanpy, Megalodon and Ice Cubes for Mastodon.
Not quite as polished as Tusky, but the additional support for features of non-Mastodon servers like Akkoma and Peertube evens it out.