1)   3CX VOIP Phone for Windows 6.0
Free VOIP / SIP phone (softphone). Use your PC as a phone. Works with any SIP / VOIP provider and phone service. Easy to use interface to transfer, forward calls or review history of calls. Free download from http://www.3cx.com

 2)   PBXPress Live CD Demo 1.1
PBXpress is a voice over IP (VoIP) replacement of traditional PBX in the era of the Internet. All of your phones are connected and provisioned via an IP network, your phone calls are always recorded and connected at a fraction of the usual cost.

 3)   Axon Virtual PBx System 2.11
Axon is a virtual IP PBx for Windows PCs featuring a one click installation setup and a web management console that makes configuring your new PBx easy. Axon offers all the normal features of a traditional PBX. Set it up in your office or home.

 4)   3CX Phone System for Windows Free 6.0
3CX VOIP Phone System FREE edition is a SIP-based IP PBX developed for Windows. Easy to install and configure, it eliminates phone wiring and allows hot desking. Lowers call costs via VOIP providers & eliminates vendor lockin. Download FREE edition!

 5)   Adore Softswitch and VoIP Billing System 2.0
Adore Infotech has announced release of it’s new Softswitch and VoIP Billing Software that is Pre-customize with Open SER and Asterisk based routing & PBX Telephony Platforms. Adore VoIP Billing Software is a Web based Real-Time Billing & Customer C

 6)   Voicent Flex PBX 1.0
Voicent Flex PBX is an easy-to-use software-based PBX system. It supports both analog phone services and VOIP services. Besides PBX features like auto attendant and unlimited call queues, it is extensible through IVR Studio for database access, etc.

 7)   Axon Free Virtual PBx System 2.11
Axon is a virtual IP PBx for Windows PCs featuring a one click installation setup and a web management console that makes configuring your new PBx easy. Axon offers all the normal features of a traditional PBX. Set it up in your office or home.