IPCop is a Linux distribution which aims to provide a simple-to-manage firewall appliance based on PC hardware. IPCop is a Stateful firewall built on the Linux netfilter framework.
Originally a fork of the SmoothWall Linux firewall, the projects are developed independently, and have now diverged significantly.
IPCop includes a simple, user managed update mechanism to install security updates when required.

Features :-

1. System-wide administratively-maintenance free filtering. The DSPAM agent can integrate into just about any network and can even be implemented as an SMTP gateway.
2. A simple-to-use learning mechanism. DSPAM allows users to simply forward their spam to their "spam email address" for learning, eliminating any learning curve necessary to make it usable by your customers. The information used in every calculation is temporarily stored on the server, enabling DSPAM to relearn the original message by looking for a small signature in the forwarded spam. As a result, users don't have to be trained to 'bounce' messages around, and administrators don't have to worry about incompatible mail clients.
3. Support for a variety of storage implementations. DSPAM's storage driver API allows the administrator to choose how they wish to store data. Currently supported drivers include SQLite, Berkeley DB, MySQL, PostgreSQL, Oracle, and a self-contained high-speed hash driver.
4. Written in C for speed, performance, and scalability. Unlike Python or PERL solutions, DSPAM is written in a low-level compiled language, meaning there is very little overhead. DSPAM runs fast, efficient, and doesn't depend on any third-party language interpreters.
5. MTA support. DSPAM works great with Sendmail, Postfix, Qmail, Courier, and Exim, and should work well with many other MTAs. In the event you happen to run something like Exchange, DSPAM can be implemented on your network as an SMTP gateway. Just point your MX at it and configure it to relay to your mail server.

OpenVPN is the virtual private network (VPN) programme for creating point-to-point encrypted tunnels between host computers.

It was written by James Yonan and is published under the GNU GPL.

OpenVPN allows peers to authenticate to each other using a pre-shared secret key, certificates, or username/password. It uses the OpenSSL encryption library extensively, as well as the SSLv3/TLSv1 protocol.

It contains many security and control features. It is not a "web-based" VPN, and is not compatible with IPsec or any other VPN package.

The entire package consists of one binary for both client and server connections, an optional configuration file, and one or more key files depending on the authentication method used.