Mastodon client for Android 8.0 or later.

(multiple account, multiple column)
- You can swipe horizontally to switch columns and accounts.
- You can add and rearrange columns.
- Column types: home, notification, local-TL, federate-TL, search, hash tags, conversation, profile, muted, blocked, follow requests, etc.

(cross account operation)
- You can favorite/follow operation as a user different from bind to column.

(other)
- Good emoji support.

source code is here.
https://github.com/tateisu/SubwayTooter

Some of the icons used in this app is based on the Icons8 https://icons8.com/license/