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Uncomplicated instant messaging tool for use within a network. Enables you to send and receive messages via WinPopup and Windows NT Messenger Service (Net Send). Doesn’t require a dedicated server.

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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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Portable version of Instant Messenger Miranda for ICQ, AIM, MSN and Yahoo networks. Requires no installation and can be run directly from USB drive. Instructions for changing languages can be found here. Fast and secure download from The H

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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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Instant messenger for the ICQ, AIM, MSN and Yahoo! networks. Fast and secure download from The H

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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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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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Records videos from several network cameras at once, at 30 frames a second, and displays them in an uncluttered way on a monitor. Also enables you to specify that recording only starts when movement is detected.

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Instant messenger for a range of different protocols, including AIM, ICQ, MSN, Yahoo, Jabber, Sametime and Novell Groupwise.

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Mobile Instant Messaging client for Jabber/XMPP accounts; if the XMPP server supports it, can also chat with contacts from AIM/MobileMe, ICQ, MSN/Windows Live, Yahoo!, Google Talk and Twitter using the free service tweet.IM; also allows group chats and retains a chat history.

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Portable version of Pidgin, the popular multi-protocol messenger (formerly Gaim). Fast and secure download from The H

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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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Simple email client with extended calendar, tasks and address book functions, designed as an alternative to Outlook. Also offers an instant messaging service. The free version requires registration. Available as an extended professional version. 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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Integrates pictures from a webcam on the desktop. Allows the images to be used simultaneously with different applications. Supports sharing the desktop screen with other computers.

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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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Enables free video and audio conversations between users via the internet, as well as conversations and text messaging over the fixed and mobile phone networks, for which there is a charge. Conversations via instant messaging also possible.

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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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