Sometimes the most mentioned doesn't mean "must read" book. Take a look at http://dev-books.com/ in your spare time.

If you want to dive into some programming language or some new fancy framework written in it, just google for "awesome <langnamehere>". There are a lot of curated git-hub repos like https://github.com/markets/awesome-ruby

Don't know what tools to use with it? Take a look at https://www.libhunt.com/