Time Sink - Time Sink helps you track how you spend your time on your Mac.
Strict Workflow - Enforces the Pomodoro time management technique by blocking distracting sites
ChatterBlocker - ChatterBlocker is the prime software to reduce the nearby conversation’s distraction that allows you to focus on your work.
Cold Turkey - Cold Turkey is a free productivity program that you can use to temporarily block distractions so that you can get your work done!
FindFocus - Anti-procrastination application for Mac and Windows.
LeechBlock - LeechBlock is an extension for Firefox and Chrome that allows users to block time-wasting sites.