Sorry, no real page for GSASM yet, download the latest version <a href="http://sourceforge.net/project/showfiles.php?group_id=207173&package_id=247939&release_id=564699">here</a>
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Anonymous SVN access (usually updated nightly, starts at gsasm-0.05):
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<B>svn co https://gsasm.svn.sourceforge.net/svnroot/gsasm gsasm</B>