https://f-droid.org/en/packages/me.hackerchick.raisetoanswer/
https://f-droid.org/en/packages/com.tutpro.baresip/
https://f-droid.org/en/packages/com.tutpro.baresip.plus/
https://f-droid.org/en/packages/org.jitsi.meet/
https://f-droid.org/en/packages/org.linphone/
https://f-droid.org/en/packages/org.sipdroid.sipua
https://f-droid.org/en/packages/org.lumicall.android
https://f-droid.org/en/packages/ro.ui.pttdroid/
https://f-droid.org/en/packages/org.whitequark.sipcaller/
https://f-droid.org/en/packages/eu.siebeck.sipswitch/
https://f-droid.org/en/packages/org.briarproject.briar.android/
https://f-droid.org/en/packages/com.serwylo.lexica

https://f-droid.org/en/packages/com.MarcosDiez.shareviahttp/
https://f-droid.org/en/packages/com.google.zxing.client.android/

https://f-droid.org/en/packages/org.connectbot/
https://f-droid.org/en/packages/ltd.evilcorp.atox/
https://f-droid.org/en/packages/com.movim.movim/

https://f-droid.org/en/packages/org.purple.smoke/