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http://kdiff3.sourceforge.net/ Formula was removed
Last version was

Recent formula history

Anastasia Sulyagina kdiff3: migrate to Homebrew Cask.
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Brett Koonce kdiff3 0.9.98
Jaime Marquínez Ferrándiz Batch convert http download urls from SourceForge to https
Mike McQuaid kdiff3: add test.

Formula code at GitHub