• Ekiga
  
  Ekiga's home.
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  in SW > VoIP with telephony by 2 users
• Gizmo – A free phone for your computer
  
  Save on calling and IM from your mobile phone. Chat with Gizmo5, MSN, AIM, Yahoo, and Jabber contacts and call any number or Gizmo5 contacts from your mobile phone at up to 90% off.
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  in SW > VoIP with telephony by 5 users
• OpenWengo
  Freedom to Call, Freedom to Code
  in SW > VoIP with telephony by 2 users

telephony from all users