I can’t tell you if this is any good but its function is handy and its price is free so if you’re a distracted Windows user, take a look and let me know what you think, would you?
From the official site:
Focus Better and Get More Done
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.
1. Run FocalFilter.
2. You choose which websites to block.
3. Set how long they should blocked for.
4. Get more work done.