This ought to be interesting. I've made this comprehensive, up-to-date, Year 2018 list of highly recommended, must-have, free Linux programs, tools and utilities, across a wide range of categories, with multiple screenshots, examples, tutorials, and guides. Have fun.

My criteria for the inclusion and nomination are relatively simple: Applications need to be robust and stable, they need to accessible, the installation process should be relatively straightforward, and ideally, these will be cross-platform tools that run on other operating systems, too. There's a certain degree of personal taste, too, but I believe my choices are pragmatic, useful and fun. With the necessary expectation for a certain amount of hype, let us proceed. And do note, in some cases, you will see older and/or official screenshots, but that's mostly for aesthetic purposes.