Network Firewall Appliance (plus!)

Platform:

• Linux-based operating system
• Runs on x86 & x86_64 chips (maybe even ARM?)
• Minimum Pentium 233mhz, 96mb RAM
• Boots with USB, SD, Compact Flash, SSD, SATA, IDE, SCSI, CDROM
• Multi-language

Features:

• IPTables (NAT and packet filter w/ SPI)
• Radius
• CBQ
• HTTP proxy
• QoS
• Load balancing & Failover
• UTMS/HSDPA (cellular)
• VPN (OpenVPN, PPTP, L2TP)
• Wireless hot-spot
• Captive portal
• DNS
• DHCP
• Spanning tree
• VLAN
• LDAP auth
• Kerberos 5
• X509
• NTP (client & server)
• PPPoE
• Virtual Server (port forwarding)

Also, additional modules available!

http://www.zeroshell.org/