Read Your Documentation Offline
Zeal is a free software that allows you to read through all the docsets for a plethora of modern programming languages, even when you’re offline. Since most documentation is now only provided online, this can be a huge help and Zeal comes packaged with over 190 different language document sets! These include hugely popular languages like HTML, java, PHP and more along with more little known languages like Ruby, Meteor and Rust; whatever language you’re writing in, their documentation is likely stored in Zeal, all easily accessible from one program.