Inkscape
Open Source
Inkscape is a free and open-source vector graphics editor software.
LibreCAD
Open Source
LibreCAD is a free Computer-aided design (CAD) application for 2D design. It works on Linux, OS X, Unix and Windows operating systems.
Vectr
Free
Vectr is a free online vector graphics editor.
FreeCAD
Open Source
FreeCAD is a parametric 3D modeler made primarily to design real-life objects of any size.
Gravit Designer
Free
Gravit Designer is a cross-platform, free design tool.
Compare Packly with alternatives
Compare Gravit Designer and Packly and decide which is most suitable for you.