3CX Phone System!

3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such as Google Nexus, Sony Xperia, Motorola Droid or S...

Brochure https://www.3cx.com/phone-system/3CXPhoneSystem_brochure.pdf
Try https://www.3cx.com/phone-system/download-phone-system/
* Overview https://www.3cx.com/phone-system
Software based PBX * Easy Admin & Install https://www.3cx.com/phone-system/linux-cloud-pbx
Easy Management * Halve Your Phone Bill https://www.3cx.com/phone-system/cut-costs-ip-telephony
Halve Your Phone Bill * Unified

Go to http://www.3cx.com/phone-system/download-phone-system.html

3CX Phone System alternatives

Asterisk

Asterisk is free software that transforms a computer into a communication server. Asterisk lets you build applications like PBX, VoIP gateway, IVR ...

tags: low-level pbx sip telecom telephony
platform: Mac OS X Windows Linux

YakYak

What does it do:

tags: Portable google-talk instant-messaging
platform: Mac OS X Windows Linux Hangouts

MicroSIP

MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack. It allowing to do high quality VoIP calls (P2P or on regular telephones...

tags: Portable voice-chat sip phone-calls
platform: Windows PortableApps.com

freepbx

FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server. Fr...

tags: pbx voice-call voip-server
platform: Linux

Telephone

Telephone is a VoIP program which allows you to make phone calls over the internet. It can be used to call regular phones via any appropriate SIP p...

tags: voice-chat sip phone-calls google-voice
platform: Mac OS X

Wazo

Wazo is mainly an IPBX that provides communication services such audio, video, and instant messaging based on the use of standard network technolog...

tags: communications extensible ip-pbx pbx phone
platform: Mac OS X Windows Linux Self-Hosted

FreeSWITCH

FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using aud...

tags: voice-chat pbx zrtp
platform: Mac OS X Windows Linux BSD

Phoner

Softphone for VoIP, CAPI und TAPI.This application enables voice connections to landline, cellular network and VoIP. Phoner can be used as softphon...

tags: voice-chat sip zrtp
platform: Windows

Zent.IO

Zent.IO is a Contact Center Cloud Software Multichannel that unify chat, phone and e-mail. All the communication channels will be answered from a s...

tags: call-center call-center-software call-recording calling collaboration-software
platform: Online

Yate - Yet Another Telephony Engine

Yate is a softswitch (concept of separating the network hardware from network software).

tags: voice-chat sip telephony pbx asterisk
platform: Linux

XiVO

XiVO is a scalable platform based on Asterisk that offers a free and complete PBX solution. It is licensed under the GPLv3.

tags: voice-chat pbx phone-system telecommunication asterisk-based
platform: Mac OS X Windows Linux

Paltalk

Paltalk is an instant messaging service that enables users to communicate via internet chat, voice and video chat. It offers chat rooms and the abi...

tags: chat-rooms instant-messaging video-calling video-chat voice-chat
platform: Mac OS X Windows Online Android iPhone Kindle Fire

Spreed

Spreed is the worldwide unified web conferencing service offering integrated web and telephone conferencing. It is based on Flash Player. Free serv...

tags: flash flash-player online-meeting screen-sharing telephone
platform: Mac OS X Windows Linux Online

YateClient

YateClient is an Instant Messenger and a SoftPhone.

tags: instant-messaging sip social-network softphone zrtp
platform: Mac OS X Windows Linux

Starfish PBX

Starfish PBX aims to be an open source alternative to Digium’s Switchvox. The goal is to have a software equivalent to which we can add additional ...

tags: asterisk pbx phone-system sip voice-chat
platform: Linux