Google Voice- Place calls and send text messages showing your Google number. Listen to voicemail and read transcripts. Currently only available in the US. NEW: Search your voicemail transcripts and text messages.
Jabber Turn your Android into an IP Phone with Cisco Jabber for Android. IMPORTANT: Cisco Jabber for Android requires an account with your company's Cisco Unified Communications ManagerTM and will not work without it
Scydo Free Calls With Scydo you can call free from/to android AND iphone Scydo users!
FriendCaller for Android Make FREE Video and Voice over IP (VoIP) calls and send instant messages to your friends and family anywhere in the world
Jamisi Caller This Mobile dialer app lets you make cheap calls to national or international destinations
MO-Call Mobile VoIP on Android MO-Call offers savings on international calls made from your mobile device. Use the MO-Call app to make cheap calls through Callback calls to avoid roaming rates wherever you are
Ventriloid Ventriloid is an open source Ventrilo 3.x client with a familiar UI. Ventriloid is based on the Ventrilo library for Linux created by the developers of Mangler