7Zip- Open Source Archive

The Best Zip Compression Utility

7-Zip is open source software. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. You can use 7-Zip on any computer, including a computer in a commercial organization.

OpenDocMan - Open Source Document Management

OpenDocMan was designed to be used for a variety of situations and solve many problems.

Twinkle - Open Source VoIP Solutions

Open Source VoIP Application

Twinkle is a open source software application for Voice over Internet Protocol (VoIP) voice communications in IP networks, such as the Internet. It is designed for GNU/Linux operating systems and uses the Qt toolkit for its graphical user interface. For call signaling it employs the Session Initiation Protocol (SIP). It also features direct IP-to-IP calls. Media streams are transmitted via the Real-time Transport Protocol (RTP) which may be encrypted with the Secure Real-time Transport Protocol (SRTP) and the ZRTP security protocols.

Ekiga – Open Source VoIP Service

Open Source VoIP Client for Windows & Linux

Ekiga is an open-source VoIP service that is compatible with Windows and Linux. Ekiga allows you to make voice and video phone calls and to send text messages to cell phones. It also enables standard telephony features like call holding, call forwarding and dial tone.
Ekiga supports a common VoIP protocol called session interface protocol and offers you a free SIP address during registration. You can configure multiple SIP addresses through the client and use those addresses simultaneously. Ekiga does not support encryption.