The CommuniGate Pro Community Edition provides a single address and identity for all forms of Internet communications. You can check your e-mail, chat with colleagues via Instant Messaging and VoIP, view multiple calendars (and other presence features), maintain address books, and view streaming RSS news feeds, all through the powerful Flash-based interface.
GNU SIP Witch is a secure peer-to-peer VoIP server. Calls can be made even behind NAT firewalls, and without requiring service providers. SIP Witch can be used on the desktop to create bottom-up secure calling networks and as a free software alternative to Skype. It can also be used as a stand-alone SIP-based office telephone server, or to create secure VoIP networks for an existing IP-PBX such as Asterisk, FreeSWITCH, or Yate.
open-cgf provides a 3GPP-compliant charging gateway function (CGF) as a sink for SGSN, GGSN, and other streamed CDRs on the 3GPP Ga/Gz interface using GTP' (GTP prime). Refer to 3GPP 32.295. These are common packet-switched data elements of GSM/UMTS mobile telephone networks. It aims to supply a telco-grade solution to this common, albeit very specialized, need. It does not decode the ASN.1 CDRs, but simply and reliably writes them to disk for later processing.
TigerCube is an operating system that offers an all-in-one communications platform (including an advanced phone system and email), network security (with a firewall, content filtering, and virtual private networking), file sharing, and a fully integrated backup solution under a single, unified environment. TigerCube is free to use for up to 5 users.