"Ich habe nichts zu verbergen und keine Geheimnisse vor WhatsApp/Facebook/Google".

Das ist ein Trugschluß, denn:

"Es geht nicht um Geheimnisse, sondern um Freiheit, rechtsstaatliche
Sicherheit und selbstbestimmtes Entscheiden über eigene Daten."

BigBlueButton enables you to share your audio, slides, chat, video, and desktop with students. Built-in polling makes it easy to engage students and recording your lectures means that you can make them available for later review.

Like many people, I recently have been re-discovering the XMPP messaging protocol and ended up running my own server. In fact, this blog is essentially a result of that effort, though it functions independently from the XMPP service.

Public Jabber Chat rooms
Christopher Muclumbus: A listing of public XMPP/Jabber chat rooms/groups.

Tox began a few years ago, in the wake of Edward Snowden's leaks regarding NSA spying activity. The idea was to create an instant messaging application that ran without requiring the use of central servers. The system would be distributed, peer-to-peer, and end-to-end encrypted, with no way to disable any of the encryption features; at the same time, the application would be easily usable by the layperson with no practical knowledge of cryptography or distributed systems. During the Summer of 2013 a small group of developers from all around the globe formed and began working on a library implementing the Tox protocol. The library provides all of the messaging and encryption facilities, and is completely decoupled from any user-interface; for an end-user to make use of Tox, they need a Tox client. Fast-forward a few years to today, and there exist several independent Tox client projects, and the original Tox core library implementation continues to improve. Tox (both core library and clients) has thousands of users, hundreds of contributors, and the project shows no sign of slowing down.

Tox is a FOSS (Free and Open Source) project. All Tox code is open source and all development occurs in the open. Tox is developed by volunteer developers who spend their free time on it, believing in the idea of the project. Tox is not a company or any other legal organization. Currently we don't accept donations as a project, but you are welcome to reach out to developers individually.

• Otr.to - p2p chat, that mean you communicate directly, no logs saved on server
• Otr.to absolutely anonymous, registration free
• Otr.to browser based, that mean you don't need to install or ask somebody to install software
• Otr.to use OTR (Off-the-Record Messaging) - most secure cryptographic protocol
• Otr.to Open-source and written in JavaScript, that mean you can check how it works

TextSecure is a free and open-source encrypted messaging application for Android. TextSecure can be used to send and receive SMS, MMS, and instant messages. The application uses end-to-end encryption to secure all messages that are sent to other TextSecure users.

TextSecure is developed by Open Whisper Systems and is released under the GPLv3 license.

The server that handles message routing for the TextSecure data channel. Communication is handled by a REST API and Push messaging (both GCM and APN).

A secure text messaging application for Android.

Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distributing and persisting JSON over an open federation of servers.

The Kontalk Network is a community-driven instant messaging network designed for smartphones and tablets.

OTR ermöglicht Ihnen private Gespräche mit IM durch:

• Verschlüsselung
  • Kein Unbefugter kann Ihre Nachrichten lesen.
• Authentifizierung
  • Es wird sichergestellt, dass ihr Gesprächspartner der ist, den Sie
    erwarten.
• Abstreitbarkeit
  • Die von Ihnen gesendeten Nachrichten haben keine digitalen
    Signaturen, die von einem Außenstehenden überprüft werden können.
    Jeder kann Nachrichten nach einem Gespräch derart verfälschen, dass
    diese aussehen, als ob Sie sie versendet haben. Jedoch ist ihr
    Gesprächspartner während einer Konversation sicher, dass die
    Nachrichten authentisch und unverändert sind.
• Folgenlosigkeit (perfect forward secrecy)
  • Wenn Sie die Kontrolle über Ihre privaten Schlüssel verlieren, ist
    kein vergangenes Gespräch gefährdet.

hackint is a communication network for the hacker community, but anyone is welcome to use the network. Hackint is fully ircv3.1 compatible

Main features
This is a short but not exhaustive list of supported features on this beta version:

Powerful MCU (Multipoint Control Unit) for audio and video mixing
Stereoscopic (spatial) 3D and stereophonic audio
Full (1080p) and Ultra (2160p) HD video up to 120fps
Conference recording to a file (containers: .mp4, .avi, .mkv or .webm)
Revolutionary way to share presentations: documents are "streamed" in the video channel to allow any SIP client running on any device to participate
Smart adaptive audio and video bandwidth management
Congestion control mechanism
SIP registrar
4 SIP transports (WebSocket, TCP, TLS and UDP)
SA (direct connection to SIP clients) and AS (behind a server, such as Asterisk, reSIProcate, openSIPS, Kamailio…) modes
Support for any WebRTC-capable browser (WebRTC demo client at http://conf-call.org/)
Mixing different audio and video codecs on a single bridge (h264, vp8, h263, mp4v-es, theora, opus, g711, speex, g722, gsm, g729, amr, ilbc)
Protecting a bridge with PIN code
Unlimited number of bridges and participants
Connecting any SIP client (Mobiles, Tablets, Desktops, Set-top-boxes, Smart TVs...)
Easy interconnection with PSTN
NAT traversal (Symmetric RTP, RTCP-MUX, ICE, STUN and TURN)
RTCP Feedbacks (NACK, PLI, FIR, TMMBN, REMB…) for better video experience
Secure signalling (WSS, TLS) and media (SDES-SRTP and DTLS-SRTP)
Continuous presence
Smart algorithm to detect speakers and listeners
Different video patterns/layouts
Multiple operating systems (Linux, OS X, Windows …)
100% open source and free (no locked features)
Full documentation
…and many others