Hosts add a preference pane to your system preferences which lets you toggle your host file entries on and off, as well as add and remove them.
Hosts.prefpane likes to keep your hosts file clean. When an entry is toggled off, it is not commented out in the hosts file, but instead stored in the app's preferences storage. This means you will have to uncomment all your unused host entries and untoggle them in the prefpane if you want to use them. Comments are treated as comments and will never show up in the list of host entries!
Ofcourse Hosts.prefpane will detect edits you made to the /etc/hosts directly and
merge them into the listing.
Backups of your hosts file is made in ~/Library/Application Support/Hosts.
The backup or your hosts file from before you started using Hosts.prefpane is
called hosts.orig and each session a backup is made called hosts.session.
The default host entries that are needed by the OS are hidden and can not be edited using Hosts.prefpane.
Click the downloads link to download the installer!
Or endorse us at coderwall: 
Licence:
Hosts, a system preference pane to manage your hosts file.
Copyright (C) 2011 PermanentMarkers
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
contact maintainer at hosts@permanentmarkers.nl