ClearOS : An integrated network server gateway solution for small and distributed organizations

ClearOS is an integrated network server gateway solution for small and distributed organizations. The software provides all the necessary server tools to run an organization including email, anti-virus, anti-spam, file sharing, groupware, VPN, firewall, intrusion detection/prevention, content filtering, bandwidth management, multi-WAN, and more. Through the intuitive Web-based management console, an administrator can configure the server software along with integrated cloud-based services.

• Licenses : GPL, Public Domain
• Implementation : PHP, Perl, C, Python, Lua

NexentaStor leverages the ZFS file system and is optimized for use in 2nd-tier NAS and iSCSI applications

NexentaStor leverages the ZFS file system and is optimized for use in 2nd-tier NAS and iSCSI applications requiring open, low cost, high performance storage as well as dramatically simplified provisioning, expansion, backup, replication, and archiving. It is also used as a primary NAS in businesses that wish to expand at closer to commodity pricing. It supports unlimited snapshots, snapshot mirroring (replication), block level mirroring, integrated search, and easy management of extremely large storage pools.

• Operating Systems : Unix

ClearOS : An integrated network server gateway solution for small and distributed organizations

ClearOS is an integrated network server gateway solution for small and distributed organizations. The software provides all the necessary server tools to run an organization including email, anti-virus, anti-spam, file sharing, groupware, VPN, firewall, intrusion detection/prevention, content filtering, bandwidth management, multi-WAN, and more. Through the intuitive Web-based management console, an administrator can configure the server software along with integrated cloud-based services.

• Licenses : GPL, Public Domain
• Implementation : PHP, Perl, C, Python, Lua

Endian Firewall : An all-in-on Linux security distribution that turns any system into a full-featured security appliance

Endian Firewall is an all-in-on Linux security distribution that turns any system into a full-featured security appliance. It features a stateful packet inspection firewall, application-level proxies for various protocols (HTTP, POP3, SMTP), anti-virus support, virus and spam filtering for email traffic (POP and SMTP), content filtering of Web traffic, and a "hassle free" VPN system based on OpenVPN.

• Licenses : GPL
• Implementation : Perl, Python, C

FreeNOS : An experimental microkernel operating system for learning purposes

FreeNOS is an experimental microkernel operating system for learning purposes. The system is very experimental, yet it currently supports virtual memory, simple task scheduling, and interprocess communication (IPC). It currently contains support for a few devices, including VGA, keyboard, i8250 serial, and PCI host controllers. FreeNOS has an experimental implementation of several filesystems, such as the virtual file system, procfs, tmpfs, and ext2fs. Current application libraries include libposix, libc, libteken (terminal emulation), and libexec (executable formats). All source code has been documented with Doxygen tags. It has been tested on recent versions of Qemu, VMWare, VirtualBox, Bochs, and bare hardware.

• Licenses : GPLv3
• Operating Systems : Linux, FreeBSD
• Implementation : C++, C, Python, SCons