Alternatives to Kaleidoscope

Visual diff and merge tool

Utility for comparing and merging files and directories

Compare files and folders

Two and three-way file comparison, merging and folder synchronisation

Visually compare folders and files

GIT client

Diff, merge, and compare code

Backup/restore tool

Folder comparison and synchronization software

Screenshot and annotation tool

Screen capturing and editing tool

GUI including a set of tools to create, alter and inspect Matroska files (MKV)