sipXecs Enterprise Communications System (ECS) is a highly robust and scalable, enterprise-grade, and fully featured unified communications solution with integrated voicemail, unified messaging, presence, call center, multiple auto attendants, paging and intercom services and a powerful plug & play web-based configuration and management system. sipXecs is based entirely on the Session Initiation Protocol (SIP) standard and operates on standard Linux operating system. It interoperates with a large number of third party phones, PSTN/IP gateways and applications such as Microsoft Exchange 2007 without compromising ease of use.

OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. Starting with the fundamental premise that complexity is the enemy of security, OpenVPN offers a cost-effective, lightweight alternative to other VPN technologies that is well-targeted for the SME and enterprise markets.

SME Server is an exceptionally reliable and easy to use network server solution.  It's powered by a secure and open Linux platform that's fully upgradeable and customizable. Simply install it on any standard PC and you'll have a robust Linux-based server capable of fully replacing those expensive Windows server licenses and providing a full range of services - including e-mail, firewall, file and print-sharing, web hosting, remote access and more.  SME Server integrates easily with Windows, Macintosh, and Unix/Linux clients, and within a Windows network environment.