SelfControl is a free, open-source application 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." Until that timer expires, you will be unable to access those sites even if you restart your computer or delete the application.
Note: While the software is classified as free, it is actually donationware. Please consider making a donation to help support development.
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