Librecad open source project, using qt development, cross-platform, can be used to learn.

LibreCAD-master
...............\.gitignore
...............\.gitmodules
...............\CLEAN.SH
...............\LICENSE
...............\LICENSE-MIT.txt
...............\LICENSE_Apache2.txt
...............\LICENSE_GPLv3.txt
...............\README.md
...............\common.pri
...............\desktop
...............\.......\graphics_icons_and_splash
...............\.......\.........................\Icon LibreCAD
...............\.......\.........................\.............\Icon_Librecad.svg
...............\.......\.........................\.............\LibreCAD_Icon 16x16.ico
...............\.......\.........................\.............\LibreCAD_Icon 24x24.ico
...............\.......\.........................\.............\LibreCAD_Icon 256x256.ico
...............\.......\.........................\.............\LibreCAD_Icon 32x32.ico
...............\.......\.........................\.............\LibreCAD_Icon 48x48.ico
...............\.......\.........................\.............\LibreCAD_Icon All Sizes.ico
...............\.......\.........................\Logo LibreCAD
...............\.......\.........................\.............\Logo LibreCAD.svg
...............\.......\.........................\.............\LogoLibrecad_335x33_bgw.png
...............\.......\.........................\.............\LogoLibrecad_335x73_bgb.png
...............\.......\.........................\.............\LogoLibrecad_499x109_bgb.png
...............\.......\.........................\.............\LogoLibrecad_499x109_bgw.png
...............\.......\.........................\Readme.txt
...............\.......\.........................\Splash Screen LibreCAD
...............\.......\.........................\......................\Splash Screen LibreCAD 01 bgb.png
...............\.......\.........................\......................\Splash Screen LibreCAD 01 bgw.png
...............\.......\.........................\......................\Splash Screen LibreCAD 02 bgb.png
...............\.......\.........................\......................\Splash Screen LibreCAD 02 bgw.png
...............\.......\.........................\......................\Splash Screen LibreCAD.svg
...............\.......\graphics_program_icons
...............\.......\......................\Licencia
...............\.......\......................\circle2pr.svg
...............\.......\......................\circleinscribe.svg
...............\.......\......................\circletan1_2p.svg
...............\.......\......................\circletan2.svg
...............\.......\......................\circletan2_1p.svg
...............\.......\......................\circletan3.svg
...............\.......\......................\ellipse4points.svg
...............\.......\......................\ellipsecenter3points.svg
...............\.......\......................\ellipsefocipoint.svg
...............\.......\......................\ellipseinscribed.svg
...............\.......\......................\librecad-icons.svg
...............\.......\......................\linesorthtan.svg
...............\.......\......................\reverse.svg
...............\.......\librecad.1
...............\.......\librecad.desktop
...............\.......\librecad.mime
...............\.......\librecad.sharedmimeinfo
...............\gpl-2.0.txt
...............\gpl-2.0greater.txt
...............\libraries
...............\.........\dxflib
...............\.........\......\dxflib.vcxproj
...............\.........\jwwlib
...............\.........\......\jwwlib.pro
...............\.........\......\jwwlib.vcxproj
...............\.........\......\src
...............\.........\......\...\dl_attributes.h
...............\.........\......\...\dl_codes.h
...............\.........\......\...\dl_creationinterface.h
...............\.........\......\...\dl_entities.h
...............\.........\......\...\dl_exception.h
...............\.........\......\...\dl_extrusion.h
...............\.........\......\...\dl_jww-copy.cpp
...............\.........\......\...\dl_jww.cpp
...............\.........\.

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