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This multi-instant messaging client is based on Mozilla technology and enables you to chat via various networks, such as Windows Live, AIM, Google Talk, ICQ, Facebook, Twitter and XMPP. Numerous add-ons are available, with which it can be greatly extended.

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Freely available engine for social networks. Extendable by custom plug-ins and themes. Implements user profiles, search function and file management.

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Java-based VoIP and Instant Messaging client that supports protocols such as SIP, Jabber, AIM/ICQ and MSN.

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Client/Server based VoIP program which allows several people to communicate with each other simultaneously over the internet.

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Open-source tool for running video conferences, with audio and video streaming over the internet. Also provides a drawing board that all participants can use, alongside a chat function, screen sharing and an option for recording complete sessions. Fast and secure download from The H

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Server for real-time communication using the instant messaging protocol XMPP (Jabber). Easy to install and manage, according to the developer. Available under commercial licence and open source (GPL).

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Instant messaging client for AIM, ICQ, Jabber/XMPP, MSN and other networks, previously published as Gaim. Also available as a portable version that can be used from an USB stick. Fast and secure download from The H

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Portable graphical IRC client based on the Qt GUI Toolkit. Supports multiple simultaneous connections to IRC servers and enables you to specify an image that is displayed to all compatible IRC clients.

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Pop-up tool that sends messages, warnings and alarms to groups in Windows networks at predefined times. You can input an expiry date for each message. Fast and secure download from The H

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Java implementation of the EDIINT AS2 standard for data exchange over the internet. Provides a graphical user interface for configuration and monitoring, a contacts manager, and a web interface for controlling the server.

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Adobe Air client for the microblogging service Twitter. Received Twitter messages are divided into various columns, such as general messages, replies, direct messages or regularly updated queries. Twitter contacts can also be sorted into groups. Also available as iOS version at the iTunes Store and as Android version at Android Market.

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Enables exchange of files in a private RetroShare network using a 2048-bit RSA access key that’s generated when the network starts up, and exchanged by encrypted email or USB stick. Also offers chat and channel functions.

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Anonymous, server-free instant messenger based on Tor's ‘hidden services’. Enables you to send text messages and transfer files between individual Tor nodes. Windows version runs without installation or other system requirements.

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Speech-recognition software that makes the keyboard and mouse redundant. Helps people with disabilities to write emails, do online banking and use the internet.

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Voice chat software designed specially for online gamers as functions for direct chats during the game are implemented; if you are playing in single-player mode, the voice of your chat partner comes directly from their particular character on the screen; with echo suppression so that other people cannot hear the incoming voices.

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Free instant messaging client with support for VPN and P2P, and integrated ICQ, MSN, AIM, Yahoo, Google Talk and Jabber protocols. Uses MD5 and SHA1 for secure authentication. Implements P2P for data traffic between the individual users. However, if several participants are involved, a separate VPN link is set up for each contact.

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Asterisk-compatible IAX and SIP soft phone. Supports the GSM, ULAW, ALAW, SPEEX and ILBC codecs. Can run from a mobile data medium without installation. Available with different version numbers for Mac and Linux.

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Enables you to integrate a Flash-based live chat function into your web site. Also available as a module for database-based CMS or forum systems like Joomla and phpBB.

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This tool helps you schedule meetings and agree on the topics to be discussed. Creates a public link that can be sent to each participant. Also available as a paid iOS version on iTunes.

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Online tool offering a fun way to learn and practice different foreign languages (Spanish, French, Italian, English and German). A multimedia language trainer with pronunciation examples with a worldwide community looking to further their language skills.

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