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
Psi
Pidgin
Adium
Gajim
Jitsi
Trillian
Miranda IM
Empathy
PhonerLite PsiLingo - 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
Adium - Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
tSIP - tomeko.net/software: SIP client for Windows.
Gajim - Full featured and easy to use Jabber client