One Sentence Journal: http://nymag.com/scienceofus/2015/03/keep-a-one-sentence-journal-be-happier.html
Happiness Jar
It saves your happy thoughts away in your browser and you can retrieve them when you are having a bad day.
Set up:
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Clone this repository
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On your Google Chrome browser, navigate to: chrome://extensions/
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Click the "Load unpacked extension" button and click on the local directory "happinessJar" that you just cloned.
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You are ready to start saving happy thoughts!