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LibreCAD is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 (GPLv2)
as published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
https://www.gnu.org/licenses/gpl-2.0.html
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The official release page is https://github.com/LibreCAD/LibreCAD/releases
Most linux based operating systems have packages: