The application’s key features include:

- Audio and Video Conferencing. Choose between 4 principal communication options: audio + video, audio only, video only, picture only.

- Meeting recording and Screen sharing. The app allows you to record sessions including sound recorded from all audio streams in exactly the way you’ve seen it in the conference.

- Recordings can be downloaded as AVI/FLV files.

- Watch and organize recordings in an integrated Drag and Drop File-Explorer

- Moderating System. During a conference, the moderater can adjust the user permission to every user individually .

- Chat and whiteboarding. Each whiteboard can have the full range of tools and documents inside, including drawing, writing, Drag n’ Drop, Resizing, Images (Drag n’ Drop from File-Explorer), Symbol(s)/Cliparts.

- And much more.

- You can see a demo version in action here.

Key features include:

- Support for multiple SIP accounts
- Detection of IP address changes
- SIP account sign-up at http://sip2sip.info
- Bonjour discovery mechanism
- Integration with MacOSX Address Book (MacOSX)
- Integration with Google contacts (Windows and Linux)
- Answering machine
- Displays RTP end-point information
- Automatically play and resume iTunes
- Multiple parallel calls
- Silent mode (do not ring on incoming call)
- Mute microphone
- Audio recording

And more. See the full feature list here.

Empathy uses Telepathy for protocol support and has a user interface based on Gossip. Empathy is the default chat client in current versions of GNOME, making it easier for other GNOME applications to integrate collaboration functionality using Telepathy.

Key features include:

- Multi-protocol: Google Talk (Jabber/XMPP), MSN, IRC, Salut, AIM, Facebook, Yahoo!, Gadu Gadu, Groupwise, ICQ and QQ. Supports all protocols supported by Pidgin.

- File transfer for XMPP, and local networks.

- Voice and video call using SIP, XMPP and Google Talk.
Some IRC support.

- Sharing and viewing location information.

- Private and group chat (with smileys and spell checking).

- Conversation logging.

- Automatic away and extended away presence.

- Automatic reconnection using Network Manager.

It is distributed as free software under the terms of the GNU General Public License. It was the default VoIP client in Ubuntu until October 2009, when it was replaced by Empathy.

Ekiga supports both the SIP and H.323 (based on OPAL) protocols and is fully interoperable with any other SIP compliant application and with Microsoft NetMeeting. It supports many high-quality audio and video codecs.

Key features include:

Call forwarding on busy, no answer, always; call transfer; call hold; DTMF support; basic instant messaging; text chat; register with several registrars and gatekeepers simultaneously; ability to use an outbound proxy or a gateway; message waiting indications; audio and video.

Dimdim Open Source Community Edition has most of the features of Dimdim Enterprise and is based on open source streaming and media components.

Designed for ease of use, WebHuddle overcomes many of the common challenges faced by other virtual meeting applications on the market — such as high-price to entry, compromised network security, large client downloads, and unreliability — resulting in a frustrated IT department and less than satisfactory business results.

Core features include:

- Cross-Platform: Use any Java-enabled computer (Linux, Windows, Unix, Mac) Learn more

- Simple: No installation needed — client runs in web browser Learn more

- Small: Thin client (about 125 KB) — loads quickly Learn more

- Secure: All data encrypted by HTTPS protocol Learn more

- Open Source: Leverage the many benefits of open source software, including value, transparency, and flexibility. If you find WebHuddle useful you may download it and freely install it on your own network.

cyn.in combines the capabilities of collaboration tools like wikis, blogs, file repositories, micrologs instant discussions, other social applications into a seamless platform.

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create: 7Z, ARC, BZ2, GZ, PAQ/LPAQ, PEA, QUAD/BALZ, TAR, UPX, ZIP;
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open: ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF and many more archive types (79 file extensions supported, see full list).

PeaZip allows to save archive’s layouts; apply powerful multiple search filters to archive’s content; handle multiple archives at once; export job definition as command line; bookmark archives and folders etc…
Other features: AES256 encryption, robust file copy, split/join files (file span), secure file deletion, compare, checksum and hash files, system benchmark, generate random passwords and keyfiles.

SolarSeek is still in a beta testing phase so functions and feautres are still being added. We will bring you further information as and when the project is out of beta.

You can still download and use SolarSeek.

It is available for Linux, Windows and Mac OS X, but as it’s using the Python programming language it is possible to run on any Python supported platform. For the user interface it uses wxPython.