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Ambrai Smalltalk is an implementation of the Smalltalk language and development environment for Mac OS X. They are currently offering free time-limited betas for download
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This page and its linked pages describe Icicles, which provides extensions to ‘completing-read’, ‘read-file-name’, and ‘M-x’. Most of these extensions involve minibuffer input completion and cycling.
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SCPlugin allows access to Subversion commands from the Finder
