Open Source Operating System

TinyOS is a open source component-based operating system and platform targeting wireless sensor networks (WSNs). TinyOS is an embedded operating system written in the nesC programming language as a set of cooperating tasks and processes. It is intended to be incorporated into smartdust. TinyOS started as a collaboration between the University of California, Berkeley in co-operation with Intel Research and Crossbow Technology, and has since grown to be an international consortium, the TinyOS Alliance.

Untangle - Open Source Firewalls

The Untangle "Firewall" is a simple traditional firewall used to block or log traffic.Untangle’s flexible deployment options and simple interface make getting started with a complete solution easier than you’d think – and at a fraction of the cost you’d expect.

Smoothwall Firewall - Open Source Firewalls

Smoothwall is a Linux distribution designed to be used as an open source firewall. Designed for ease of use, Smoothwall is configured via a web-based GUI, and requires little or no knowledge of Linux to install or use. Smoothwall is also a private software company based in the UK that develops firewall and web content filtering software, and which also maintains the  SmoothWall open source project.

Endian Firewall - Open Source Firewalls

Endian Firewall Support Services

The Endian Firewall is an open source GNU/Linux distribution that specializes on Routing/Firewalling and Unified Threat Management. It is being developed by the Italian Endian Srl and the community. Endian is originally based on IPCop, which itself was a fork of Smoothwall.