Gas Mask - Gas Mask is simple hosts file manager for Mac OS X.
TinyWall - Lightweight and non-intrusive firewall
SwitchHosts - Free and open source hosts management & switching app
SonicWall - SonicWall security solutions protects your network, systems, users and data from cyber threats.
BlueLife Hosts Editor - BlueLifeHosts editor is a Portable freeware application for editing windows Hosts file ,(easily add/delete , Block , Update domain names)
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more