FocalFilter

FocalFilter is a free productivity tool that helps you focus by temporarily blocking distracting websites. After the block timer runs out, your websites are available for you to view again.

Free Windows

Block Site Extension

Block Site is a browser addon to help you block desired websites. To operate, simply right-click on any webpage and click on the "Block this website"...

Free Mac OS X Windows Linux Chrome OS Chrome

BlockSite

BlockSite is an extension, which automagically blocks websites of your choice. Additionally, this extension will disable all hyperlinks to these websites, by just displaying the link text without the clicking functionality.

Free Windows Linux Mac Chrome Firefox