Dowse eases the configuration of network routing for a local area network, starting from the setup of ARP-level static entries of known peers, IP-level firewall, DHCP configuration, and local DNS cache, up to an application layer transparent proxy and optional gateways to anonymous networks such as Tor and I2P. It consists of a minimalistic script which can run on any GNU/Linux box and which, from a central configuration point, controls Ebtables, Iptables, and all the daemons needed for such operations: DnsMasq, Squid2, and Privoxy. It comes with a module system for contributed add-ons like DNSCrypt-proxy and HTTPS-everywhere.
Forban is a P2P file sharing application for link-local and local area networks. Forban works independently from the Internet and uses only the local area capabilities to announce, discover, search, or share files. Forban relies on HTTP and is opportunistic, meaning that it replicates any files of interest seen in its proximity. The Forban protocols are minimalistic to ease the production of other implementations.
TheSSS (The Smallest Server Suite) is a lightweight server suite distributed as a live CD. It is designed for system administrators who need a small (less than 30MB) set of server software for small local area networks. The supported servers are FTP, HTTP, SFTP, SSH, and Telnet. A proxy server (Polipo) with the Tor anonymizer is also included. The main security components are a 4MLinux Firewall (based on iptables) and Clam AntiVirus.