Das inoffizielle Android-Handbuch
Messenger Marketing: Wie Unternehmen WhatsApp & Co erfolgreich für Kommunikation und Kundenservice nutzen
Prominente Geheimdaten. Wann Datenschutz zum Medienskandal wird
You: For Sale: Protecting Your Personal Data and Privacy Online
Professional XMPP Programming with JavaScript and jQuery (English Edition)
Mastering The XMPP Framework: Develop XMPP Chat Applications for iOS (Mastering iOS Frameworks Book 3) (English Edition)
Professional XMPP Programming with JavaScript and jQuery by Jack Moffitt (2010-01-07)
Messenger & Conferences
Messenger with encryption
2020-07-02
XMPP/Jabber
2020-07-03
- Conversations (Jabber / XMPP) (4.4@1,849; ~EUR 2.50) Ǥ 26
1 
/ Conversations Legacy (4.1@152) 14 
LastUpdate: 2018-10-13 / Share Location Plugin (4.5@72) Ǥ 7 LastUpdate: 2017-12-28 / Voice Recorder Plugin (4.2@58) 3 LastUpdate: 2016-11-13 Github; XMPP/Jabber; PGP/OTR/OMEMO; Wikipedia DE | EN; Vorstellung & Schnelleinstieg 5/2016; Anleitung für Anfänger 7/2018 - Quicksy (4.4@68) Ǥ 25 1 Github; Vorstellung 11/2018; fork of Conversations using your phone number as ID
- Pix-Art Messenger (XMPP / Jabber Client) (4.2@182) Ǥ 29 1 Github; fork of Conversations
- Xabber (4.1@12,078) Ǥ 11 4 Github; Vorstellung 11/2013; Testbericht 8/2013
- aTalk (Jabber / XMPP) (3.8@71) 21 1 Github
- Conv6ations (0@0) 24 fork of Conversations
Matrix/riot
2020-07-03
- mini Vector (4.3@22) Ǥ 14 1 Github; riot client; see here for privacy issues with the Matrix/riot network
- Riot.im (3.8@1,291) Ǥ 29 2 / RiotX - Next Generation Matrix Client (0@0) 14 Github; Kurzvorstellung 12/2016 / Github
- Ditto Chat (0@0) Ǥ 9 1 GitLab
- Syphon (0@0) 5
Github; Matrix
Miscellaneous encrypted messenger
2020-07-03
- Wickr Me – Private Messenger (5@74,638) Ǥ 20 3 Vorstellung 9/2013; Intro 9/2013; Wikipedia EN; end-to-end encryption with mission-impossible-flair (self-destructing messages)
- ShazzleChat - No Servers, No Web, Always Secure. (4.9@166) Ǥ 12 2 Intro 5/2020
- Threema (4.6@61,642; ~EUR 4.00) Ǥ 26 2 / Threema Work (3.9@905) Ǥ 19 1 / Threema QR Scanner Plugin (4.5@7,873) 1 LastUpdate: 2018-03-06 Video Review 12/2013 (EN) | 4/2016 (DE) | 3/2019 (DE); Video Backup & Restore (3/2019); Video Threema Webchat Howto 2/2017 (DE); Threema Video Tutorials; Test 4/2016; Vorstellung 2/2014 | 2/2014 | 2/2014 | 8/2018 | 11/2018; Wikipedia DE|EN; Audit 11/2015 | 3/2019; Tipps & Tricks 12/2015; Anrufe 9/2017; Backup Tipps 10/2017; (Datenschutz-) Testbericht 2/2020
; FAQ; messenger with end-to-end encryption - Signal Private Messenger (4.5@484,162) Ǥ 49 Testbericht 11/2013; Vorstellung 11/2015 | 11/2015 | 11/2015 | 8/2018-6/2020 | 11/2015; Video-Vorstellung 1/2020; "Crypto-SMS" und verschlüsselte Telefonie (ehemals TextSecure + RedPhone)
- whispeer Messenger (4.5@29) Ǥ 16 1 LastUpdate: 2018-08-01 Github; DerStart 8/2015; FU-Berlin 5/2017
- Telegram (4.4@5,400,073) Ǥ 41 Github; Testbericht 10/2013 | 7/2016 | 3/2020; Meldung 4/2014; Vorstellung 5/2014 | 8/2018-6/2019; Security Analysis 5/2017; Video Erklärung 7/2019; Wikipedia DE|EN; encryption and self-destruct timer
- VIPole Private Messenger (4.4@10,722) Ǥ 19 2 also available for Windows, Linux and Mac OS, paid subscription needed for end-to-end encryption
- Rocket.Chat (4.3@4,846) Ǥ 22 Github; chat with screen and file sharing, and more
- surespot encrypted messenger (4.3@3,392) Ǥ 11 2 Github; Vorstellung 2/2014; Wikipedia DE|EN; send encrypted messages. unlock voice messages per in-app payment. AES end-to-end encryption.
- Hoop Messenger (4.2@4,443) Ǥ 33 3 Intro 4/2020
- TigerConnect - Clinical Solutions (4.1@5,095) Ǥ 32 4
- Kontalk Messenger (4.1@595) Ǥ 32 2 Github; Vorstellung 8/2018
- Delta Chat (4.1@114) 21 1 Github; Vorstellung 6/2019
- ginlo (SIMSme Private) (4@15,932) Ǥ 18 1 Vorstellung 9/2018
- Briar (3.9@649) 14 / Briar Beta (Unreleased) (0@0) 9 LastUpdate: 2018-04-25 Video Intro 7/2017; Video Review 7/2018; Vorstellung 9/2018 / Kurzvorstellung 2/2018; Source & Issues
- Secure MMX Encrypted Messenger (3.9@28) Ǥ 14 LastUpdate: 2016-11-20
- Nextcloud Talk (3.8@694) Ǥ 23 1 Github
- Jami (3.6@912) Ǥ 18 1 Wikipedia EN; FAQ; background 9/2015 (EN) | 9/2015 (DE); Vorstellung 5/2020; desktop clients for Linux, Mac, Windows
- Wire • Secure Messenger (3.5@32,447) Ǥ 16 Testberichte 4/2017 | 3/2020;
Privacy-Warnung 7/2018; Vorstellung 8/2018 - 4/2020; free/gratis, encrypted communication: voice, video and group chats; cross platform: Android, iOS, Mac, Windows. Or in the web browser. - Chiffry Secure Messenger (3.2@870) Ǥ 25 1
- Hoccer – the secure Messenger (2.6@8,086) Ǥ 14 2 LastUpdate: 2018-09-04 Vorstellung 8/2018
- Pattle (0@0) Ǥ 8 1 client for riot/Matrix
- Dib2Qm (0@0) 8 GitLab; based on IMAP and QuickMSG (no centralized server)
- Snikket (0@0) 24 Github; XMPP client forked from Conversations
Video and Audio Conferences
2020-06-29
- Mumla - Mumble VoIP (5@11) 12 GitLab; audio calls/conferences; client for Mumble (Wikipedia DE | EN)
- Skype - free IM & video calls (4.3@11,155,659) Ǥ 43 5 / Skype Lite - Free Video Call & Chat (4.3@35,298) Ǥ 39 4 Video Review 7/2013; Review 7/2013 / Vorstellung 3/2018
- Riot.im (3.8@1,291) Ǥ 29 2 / RiotX - Next Generation Matrix Client (0@0) 14 Github; Kurzvorstellung 12/2016 / Github
- Nextcloud Talk (3.8@694) Ǥ 23 1 Github
- Jami (3.6@912) Ǥ 18 1 Wikipedia EN; FAQ; background 9/2015 (EN) | 9/2015 (DE); Vorstellung 5/2020; desktop clients for Linux, Mac, Windows
- Wire • Secure Messenger (3.5@32,447) Ǥ 16 Testberichte 4/2017 | 3/2020; Privacy-Warnung 7/2018; Vorstellung 8/2018 - 4/2020; free/gratis, encrypted communication: voice, video and group chats; cross platform: Android, iOS, Mac, Windows. Or in the web browser.
- Jitsi Meet (3.3@24,857) Ǥ 15 3 Github; Anleitung 3/2020; Vorstellung 4/2020
Further Readings:
- Homeoffice? Beliebte Dienste und Geheimtipps für Video-Chat (4/2020)
- Vorstellung verschiedener Messenger: Warum Signal Messenger eine super Alternative zu WhatsApp ist (3/2020)
- Die verrückte Welt der Messenger: Teil1 (1/2020) | Teil2 (2/2020)
- Verschlüsselte Messenger: Threema, Signal, Telegram, WhatsApp (11-2015 - 6/2019)
- Wire, Hoccer, Kontalk (9/2017)
2020-07-05