Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
Gas Mask - Gas Mask is simple hosts file manager for Mac OS X.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
SwitchHosts - Free and open source hosts management & switching app
HTTP Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.
BlueLife Hosts Editor - BlueLifeHosts editor is a Portable freeware application for editing windows Hosts file ,(easily add/delete , Block , Update domain names)