qksms quik: https://f-droid.org/packages/dev.octoshrimpy.quik/ (works fine, last update is almost a year ago)
simple fossify: https://f-droid.org/packages/org.fossify.messages/ (up to date)
silence: https://f-droid.org/packages/org.smssecure.smssecure/ (no updates)
Riseup’s Purpose
The Riseup Collective is an autonomous body based in Seattle with collective members world wide. Our purpose is to aid in the creation of a free society, a world with freedom from want and freedom of expression, a world without oppression or hierarchy, where power is shared equally. We do this by providing communication and computer resources to allies engaged in struggles against capitalism and other forms of oppression.
☞ https://riseup.net/en/security
or/and https://www.autistici.org/
We believe that this world is far from being the best world possible. We react by providing a platform and tools for digital self-defense addressing the need of free communication for activists and other individuals.
Which services do A/I provide?
We provide a suite of communication tools:
Email
Blogs
Mailing lists and Newsletters
Web Hosting
Instant Messaging and Chat
Videoconference and Streaming
Anonymity Services
i know, but edited for clarification 👍