If you use Homebrew as your package manage on OS X then you really should consider adding Homebrew-cask. A simple howto is available here.
One of the great things about Homebrew-cask is that you can look at all of the applications in the directory and see all the different applications that are out there that you may not have known about.
I came across a simple hosts file manager called Gas Mask. If you're someone like me who works multiple projects and has to maintain a number hostnames so that they resolve to IP Address, then you may find this tool fairly useful.
It's fairly simple and there's already some good write-ups out there so I won't clog up the internet tubes with unnecessary redundancy. If you have Homebrew and HomeBrew-Cask installed, it's super simple to get started. Just run:
brew cask install gas-mask
Then follow the instructions here to get started.