https://cran.r-project.org/doc/manuals/R-admin.html#Installing-R-under-macOS https://www.activestate.com/activetcl/downloads links to ActiveTCL which has non open-source license: http://docs.activestate.com/activetcl/8.5/get/license/ "ActiveState Confidential Information includes the Software, including all source and object code, and all associated documentation, but not Accessible Code."
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