8 Best Open Source Web Development Tools Used by Web Developers for Managing Code Changes and Collaborating With Others on Projects. It Allows for Easy Tracking of Changes, Keeps a History of All Changes, and Supports Branching and Merging. It Provides a Set of CSS and Javascript Tools That Make It Easy to Create Responsively, Mobile-first Websites and Applications. It is Easy to Work With Html Documents, Handle Events, Create Animations, and Perform Other Common Tasks in Web Development.