My favorite is IRIS web but here is some of them.
Amethyst (Android)https://play.google.com/store/apps/details?id=com.vitorpamplona.amethyst
Damus (iOS)https://apps.apple.com/us/app/damus/id1628663131
Iris (web browser)https://iris.to/
Nostros (Android)https://apt.izzysoft.de/fdroid/index/apk/com.nostros
Snort social (web) https://snort.social/
Hamstr (web) https://hamstr.to/home
Iris (ios) (must install test flight app then)open->