LeechBlock is a simple free productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.
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Concentrate has been discontinued. Similar apps include LeechBlock, which is free and open source. Other options are SelfControl, Freedom, StayFocusd and FocusMe. You can choose from more than 10 Anti Procrastination Tools like Concentrate for Mac, Windows, Linux, Android and iPhone.
LeechBlock is a simple free productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.




SelfControl is a free and open-source application for Mac OS X that lets you block your own access to distracting websites, your mail servers, or anything else on the Internet. Just set a period of time to block for, add sites to your blacklist, and click "Start.
Be incredibly focused and productive. Join millions of amazing people who use Freedom to manage their screen time and live happier, healthier, and more productive lives.




StayFocusd is a productivity extension for Google Chrome that helps you stay focused on work by restricting the amount of time you can spend on time-wasting websites. Once your allotted time has been used up, the sites you have blocked will be inaccessible for the rest of the...

Block distractions on Windows, Mac, and Android with FocusMe's Blacklist, Whitelist, Time Tracker, Scheduler, Pomodoro Timer, and security features like Password Protection and Forced Mode to boost productivity by customizing user feedback-based settings.



Focus is a Mac app that blocks distracting websites and applications so you can get peace of mind, and get some work done!.




Vitamin-R is a focus and time-boxing app for macOS from indie developer publicspace.net, available since 2010.



Too many windows to manage? Big display? Or getting lost in multiple monitors? HazeOver is for you! ? TRIAL version: HazeOver.com




1Focus lets you block distracting apps and websites to skyrocket your productivity. Beat procrastination and get things done by focusing on one task at a time. Ideal for students, entrepreneurs, and creative people.



Push distractions aside, silence disruptions and enter a zen like state of focus with Quiet for Mac OS X. With the push of a button, silence noisy applications and fade out all unwanted windows. It gives you that moment of peace you need to get on with work.



The Productivity Owl is a Google Chrome extension that eliminates your time wasting habits on the internet.




Linux port of the Mac OS X application SelfControl . Uses Perl/Gtk2 + iptables. Provides basic timed blocking of specified hosts.

