Serene
Serene is a productivity system based on moments of profound focus, not merely a distraction blocker. When it's time to buckle down and get some work done, users create a list of websites and applications that they find distracting and then block them. But there's more to this place than that.
The software is designed to help you arrange your day. Make a list of how many projects you want to work on and how long each one will take. Then, when you're ready to work, press the Go Serene button to begin a timer. Every time you try to open a site that you shouldn't, all of your distractions will be blocked, optional concentration music will play, and you'll be informed that it's time to focus and display your countdown timer. These elements work well together—you're not only blocking distractions but also reminding yourself of what you'd like to accomplish.
Detailed information:
Price: Free
Platforms: Mac
Link: https://sereneapp.com/