Router adalah sebuah alat jaringan komputer yang mengirimkan paket data melalui sebuah jaringan atau Internet menuju tujuannya, melalui sebuah proses yang dikenal sebagai routing. Proses routing terjadi pada lapisan 3 (Lapisan jaringan seperti Internet Protocol) dari stack protokol tujuh-lapis OSI.
Dibawah ini adalah beberapa software router yang gratis / free routing software:
IPCopA secure Linux distribution managed through a web-interface. It turns an old PC into a firewall and VPN gateway. Features an Intrusion Detection System.
Simply put, Vyatta has commoditized router, firewall and VPN deployment in the same way that Linux commoditized the operating system market. Vyatta open-source networking offers you an alternative to over-priced, inflexible products from proprietary vendors.
pfSense is a free, open source customized distribution of FreeBSD tailored for use as a firewall and router. In addition to being a powerful, flexible firewalling and routing platform, it includes a long list of related features and a package system allowing further expandability without adding bloat and potential security vulnerabilities to the base distribution.
GNU Zebra is free software that manages TCP/IP based routing protocols. It is released as part of the GNU Project, and it is distributed under the GNU General Public License. It supports BGP-4 protocol as described in RFC1771 (A Border Gateway Protocol 4) as well as RIPv1, RIPv2 and OSPFv2.
XORP is the industry's only extensible open source routing platform. It is in broad use worldwide, with thousands of downloads by companies and educational institutions and an active international developer community.
ORP is a stand-alone GNU/Linux distribution which aims to be a complete PC-based router solution.