szos/CLFM is an open source project licensed under GNU General Public License v3.0 only which is an OSI approved license.
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To operate on files and directories, see UIOP and this new library: https://github.com/Ambrevar/fof (File Object Finder). You could start using the Lem editor and Lisp REPL, the Nyxt browser, this basic file manager (https://github.com/szos/CLFM), cmd to fire external commands (https://github.com/ruricolist/cmd).
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Another one based on McClim: https://github.com/szos/CLFM (couldn't try, doesn't load for me) Last commit 2020.