Telephone
Telephone is a VoIP program which allows you to make phone calls over the internet.
20 Alternatives To Telephone
3CX Phone System
3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such…
Acrobits Softphone
Acrobits Softphone, an app for entry into the world of SIP.
Asterisk
An open source telephony switching and private branch exchange service for Linux.
Blink
Blink is a team and employee app, with a Feed, Chat and Hub (for documents, links, files).
Bria
VoIP and video calling, messaging and presence - all from your computer desktop with the award-winning Bria 5 softphone client.
Ekiga
Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for…
Jitsi
Open-source video calling and chat platform.
LINE
LINE is a Japanese proprietary application for instant messaging on smartphones and PCs.
Nimbuzz
Get the latest, headlines, breaking, regional news fast.
Phoner
Softphone for VoIP, CAPI und TAPI.
Signal
Fast, simple & secure messaging. Privacy that fits in your pocket.
Starfish PBX
Starfish PBX aims to be an open source alternative to Digium’s Switchvox.
Vodia Networks
Vodia Phone app is a free add-on for your Vodia PBX that lets you connect to your account on your…
Wazo
Wazo is a unified communications platform based on Asterisk and focused on extensibility.
Wire
Private & Secure Messenger
X-Lite
The X-Lite softphone from CounterPath. Try out our fully-loaded Bria desktop client including voice and video call, messaging and presence or download X-Lite for try to test SIP softphone features.
YakYak
Desktop client for Google Hangouts
Zoiper
Cross-platform VoIP softphone dialer for SIP and IAX systems
freepbx
FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).
tSIP
tomeko.net/software: SIP client for Windows.