Meld
Visual diff and merge tool
...It supports two-way and three-way comparisons, making it especially useful for reviewing code changes and resolving merge conflicts. Meld provides live comparison updates, allowing users to see differences immediately as files are edited. With built-in navigation tools, users can move quickly between changes and work directly on specific change blocks. The tool integrates with many popular version control systems, helping developers better understand patches and project history. Widely used on Linux and available for Windows, Meld is a reliable solution for managing and understanding differences in code and files.