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

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Enables several Skype accounts to be used in parallel. Fast and secure download from The H

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Client for the multi-instance ICQ instant messaging system, with fast chat for typing a message directly in the contacts list. Special versions of Sat1 or ProSieben are available. Also available as ICQ app for Windows 8 and RT, ICQ Mobile for Windows Phone, an app for iPhone, iPod Touch and iPad and as anAndroid version.

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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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Peer-to-peer program. Allows release of local storage space for sharing over a network or the internet. Provides a chat for workgroup discussions and a virtual whiteboard for simple sketches.

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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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Application to allow video communication and instant messaging over the internet with several people simultaneously. Video conferences can also be recorded as needed and saved on the hard drive.

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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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Chat client for any number of IRC connections. Features include a DCC file transfer function, command and nick completion, syntax overlay function, encryption, spell check and script support.

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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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