What are some alternatives?
When comparing Visual Studio Team Services and Diff So Fancy, you can also consider the following products
Helix ALM - Helix ALM is the single, integrated application that lets you centralize and manage requirements, test cases, issues, and other development artifacts and their relationships.
WPMU DEV - WPMU offers WordPress Plugins, WordPress Themes, WordPress Multisite and BuddyPress Plugins and Themes.
codeBeamer ALM - Integrated application lifecycle management (ALM) platform
MAMP - MAMP is the abbreviation for Macintosh, Apache, MySQL, and PHP. It is a reliable application with its four components that allows you to access the local PHP server as well as the database server (SQL).
Atlassian Bitbucket Server - Atlassian Bitbucket Server is a scalable collaborative Git solution.
Firefox Developer Edition - Built for those who build the Web. The only browser made for developers.