#foss #open-source digital diagram makers for those who want to create understandable idea's or make mindmaps and logical art.
2: Calligra.org (from KDE) (Calligra Karbon)
3: live.gnome.org/dia (from gnome)
4: inkscape.org
5: documentfoundation.org (libreoffice draw)
or do you use something else, perhaps CAD software?