A network access control (NAC) system featuring a captive-portal for registration and remediation, wired and wireless management, 802.1X support, isolation of devices, integration with IDS; it can be used to secure networks from small to large.
Sourcecode is hosted here: https://github.com/inverse-inc/packetfence
Issue tracker is hosted here: https://github.com/inverse-inc/packetfence/issues
Simple and easy to use program that helps configuring the network interfaces, allows to have multiple configurations for the same computer and to easy configure NAT for internet sharing.