A commercial add-on providing an alternative to native Snippets and Global variables.
From the website:
Do away with the native Snippets or Global Variables—Low Variables gives you both in a single interface and lets you do so, so much more. Want to group your variables? No problem. Want to choose which variables are parsed early and which ones are not? Check. Want to save your variables as files on the server? Yes, you can! Want to have control over who can edit the variables? You got it. Want to have different variable types, just like field types? It ships with 12 variable types built in and there are several third party types available.
More information can be found at http://gotolow.com