Vim makes it easy to quickly open a URL that appears in a file. Simply move
the cursor over the URL and hit gx. This will use your respective
operating system's open command (e.g. open for Mac OS X) to open the
URL.
One caveat is that the URL must contain the protocol/scheme. That is,
www.duckduckgo.com won't work, but https://www.duckduckgo.com will.
You can also use gx to open files on your system.