Tuta Mail
Encrypted email & calendar service - easy to use, secure by design.GPL-3.0-or-later
Conversations
Encrypted, easy-to-use XMPP instant messenger for your mobile deviceGPL-3.0-only
AndBible: Bible Study
Read the Bible, study commentaries or dictionaries, or read books offline.GPL-3.0-or-later
Jami
Share, freely and privatelyGPL-3.0-or-later