You might already know that using a set of internet tools is one of the best ways to increase your productivity. It's different for different people, and it keeps on changing as we find better alternative to the current ones. Here’s a comprehensive list of some of the best productivity tools and apps -- categorized & subcategorized. And hey, it's possible that your favorite social media productivity tool is missing here but I have already organized all the social media productivity tools at -- Social Media Tools 101. And yeah, most of the tools that I have mentioned here are free or freemium or comes with a free trial.