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3CX VOIP PBX - provides an easy to use, plug and play SIP - IP PABX for Windows. With a software based IP PBX you will save on PBX maintenance and halve your phone bill. Download the FREE edition today and break free from your proprietary phone syste...

Office SIP Server is free VoIP and Instant Messaging Software

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SIP Hosted PBX, Multi-Tenant, VoIP Platform for Service Providers - provides scalable and reliable SaaS IP Telephony Platform. Based on the Session Initiation Protocol (SIP), the Brekeke products provide robust SIP Communication Platform for Service ...

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Windows 7 tips, tricks, tutorials, news, downloads, Internet Explorer, Windows Phone, Live, Office, Security Tips.

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Open Source SIP Server - Kamailio (former OpenSER)

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

Since 1983, developing the free Unix style operating system GNU, so that computer users can have the freedom to share and improve the software they use.