gEDA

The gEDA project has produced and continues working on a full GPL'd suite and toolkit of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture, simulation, prototyping, and production.

http://www.geda-project.org/
Fork lepton-eda https://github.com/lepton-eda/lepton-eda

SlackBuilds

cd /tmp
wget http://ftp.geda-project.org/geda-gaf/stable/v1.8/1.8.2/geda-gaf-1.8.2.tar.gz
wget http://slackbuilds.org/slackbuilds/14.1/academic/geda-gaf.tar.gz
tar xvzf geda-gaf.tar.gz
mv geda-gaf-1.8.2.tar.gz geda-gaf/
cd geda-gaf
ls
./geda-gaf.SlackBuild
installpkg /tmp/geda-gaf-1.8.2-i486-1_SBo.tgz

Debian (bullseye)

   1 sudo apt install lepton-eda
   2 lepton-schematic &