HostsMan!

BlueLife Hosts Editor is a portable freeware hosts-file editor and allows you to easily add/delete, block, and update domain names to your hosts file.

Gas Mask is simple hosts file manager for Mac OS X. It allows editing of host files and switching between them.

A very simple and lightweight indicator applet to manage hostsblock: https://github.com/gaenserich/hostsblock

BeeThink IP Blocker is a Windows IP Blocking program which controls one computer interacts with other computers over the network. It can be successfully used on Windows server machines, in a production environment, to easily ban unwanted IP addresses or visitors by country with Apache's .htaccess files. BeeThink IP Blocker is a lightweight firewall and the rules are based on IP address, port, protocol, and other TCP/IP factors.

SwitchHosts! is an App for hosts management & switching.It is a free and open source software.

Localghost makes it easy to switch development host names to resolve to localhost with a status item (i.e. system tray) that adds / removes entries from /etc/hosts.

HostsXpert is an ultra-groovy Hosts file Manager, Editor and Helper-outter. Below you'll find a list of HostsXpert's functions. Just a Simple word of caution - Hosts files are not to be taken lightly -

Saving your time when you switch domain-ip mapping between different environment.

Hosts switcher allows you to change and reload your hosts file based on a simple template language.