VMukti open source is an Asterisk/Yate enabled p2p Video IP Communications Suite for Web / PSTN. This serverless broadband ready platform enables OS community to save 90% on capital & operating costs over proprietary software for conferencing. Along with open source products, vmukti also offers a Live/Pre-recorded video streaming solution. It provides you simple software to broadcast live and also upload live video feed from the client end.
Ekiga (formely known as GnomeMeeting) is an open source video conferencing and VOIP software for GNOME. It uses both the H.323 and SIP protocols and supports many audio and video codecs, and is interoperable with other SIP compliant software like Microsoft NetMeeting.
BigBlueButton supports sharing of slides (PDF and PPT), video conferencing , whiteboard, chat, voice (using Asterisk or FreeSWITCH), and desktops.
OpenMeetings is a free open source video and web conferencing software. You can use your microphone or webcam, share documents on a whiteboard, share your screen or record meetings. It is available as hosted service or you can download and install a package on your server with no limitations in usage or users.
QuteCom (previously called WengoPhone) is a free software SIP compliant VoIP client developed by the QuteCom (previously OpenWengo) community under the GNU General Public License (GPL). It allows users to speak to other users of SIP compliant VoIP software at no cost. It also allows users to call landlines and cell phones, send SMS and make video calls. None of these functionalities are tied to a particular provider, allowing users to choose among any SIP provider.
OpenVCS stands for Open Source Video Conferencing Server and uses SIP (RFC 3261, 3GPP TS 24.229) protocol. OpenVCS is used as a Multipoint Control Unit (MCU) manager. The application can managed any number of MCU (a.k.a Bridge) where each Bridge can support up to 64 participants. The application can be used as a standalone SIP server or behind an IMS Core where each Bridge will be seen as an Application Server. You can use any SIP compliant device to connect to a bridge as long as the client is RFC 3261 compliant. For example, you can use IMSDroid on Android, iDoubs on iOS (iPhone, iPod Touch or iPad), Boghe on Windows or Linphone/Bria on MAC OS X or Linux.
ooVoo is free for PC and Mac. Its desktop application allows you to video chat with your friends and family on their own PCs or Macs, and also on their smartphones (iOS, Android) and tablets.
Group video calls with up to 12 people can be recorded and you can upload calls to YouTube, send instant messages to your contacts on ooVoo and set up a web chat room for free.
SightSpeed brings you the world's best video and voice calling service for both Macs and PCs. You can make free video calls, PC-to-PC voice calls, or simply make and receive calls to and from regular telephones. It provides a smooth, natural video with no delay. Mac users can connect with full quality to Windows users, and vice versa. You can also create and send video mails to anyone with an email address. Have multi-party video calls with up to 4 people at a time and have a video or voice call with anyone, even non-SightSpeed users.