VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.
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PhonerLite
Lingo
Tragofone
tSIP
SessionTalk SIP Softphone
YakYak
Phoner
Jami
Empathy
Pidgin
Trillian
Skype
Adium
Facebook Messenger
IM+
Jitsi
PhonerLite EmpathyLingo - Empower Creation and Ensure Brand Consistency. Build and Share libraries of visual assets with your entire team — all from your desktop.
Pidgin - Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.
Tragofone - White-label VoIP Softphone with WebRTC and Auto-provisioning
Trillian - Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.
tSIP - tomeko.net/software: SIP client for Windows.
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.