ClickMeeting - Collaborate with partners and clients using ClickMeeting professional web conferencing software. Try it now, FREE!
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Lingo - Empower Creation and Ensure Brand Consistency. Build and Share libraries of visual assets with your entire team — all from your desktop.
BigBlueButton - Engage Your Online Students. BigBlueButton is a web conferencing system designed for online learning.
tSIP - tomeko.net/software: SIP client for Windows.