1)   3CX VOIP Phone for Windows 1.0
Free VOIP / SIP phone. Use your PC as a phone. Works with any SIP/ VOIP provider/ phone service. Easy to use interface to transfer, forward calls or set-up conference calls. Free download from http://www.3cx.com
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 2)   3CX Phone System for Windows Free 5.1
3CX VOIP Phone System FREE edition is a SIP-based IP PBX developed for Windows. Easy to install & configure, it eliminates phone wiring & allows hot desking. Lowers call costs via VOIP providers & eliminates vendor lockin. Download FREE edition!
Phone system, IP PBX, PBX, PABX, VOIP phone system, SIP, VOIP, office phone system, small business phone system,

 3)   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.
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