Name:GitHub (Free)
URL:https://github.com/
Description:World’s largest community of developers and their projects
Utility: This free tool - 

• Brings team together to work through problems, move ideas forward, and learn for each other along the way
• Enables host and review code 
• Helps manage projects and build software 
• Helps find the right tools and
• Enables write better code
• Allows access control