Kaleidoscope Alternatives for Mac OS X

KDiff3 is a versatile graphical file and directory comparison and merging tool, designed to help users identify differences, merge changes, and synchronize files and folders efficiently. It supports comparing up to three files or directories simultaneously, offering detailed character-by-character analysis and a robust merge editor.

Araxis Merge is a powerful two- and three-way file comparison and merging application designed for developers, technical writers, and legal professionals. It simplifies the process of identifying differences between files, folders, and even database content, offering intuitive merging tools.

SmartSynchronize is a robust, multi-platform file and directory comparison and merging tool. Ideal for developers, writers, and anyone needing to effectively manage file differences and synchronize content across folders.