Self has dramatically influenced many aspects of modern programming --- from popularizing prototype-based object systems, to demonstrating the degree to which language dynamism need not cost run-time performance (it inspired modern JIT JVMs, although of course that line goes back to Smalltalk), to teaching us new ways of thinking about graphical user interfaces.
Now there's a new version of Self released, as of a couple of weeks ago, at http://research.sun.com/self/release_4.2/release.html --- and it's under a revised-BSD-style open-source license.
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