Use Org-Mode Links for Absolutely Anything10 Aug 2014, by Artur Malabarba.
The Power of Org-links post series
One little-know feature of org-mode is that you can define new types
of links with the aptly named
org-add-link-type. The applications of
this virtue are many. One might, for instance, write links which
search an entire code base for an expression.
Then, when you click on something like the following link in an
org-mode buffer, you'll be taken to a list of results.
LINK header arguments
As /u/blue1_ points out, for links that are simple URL substitutions
you can also use