DraftSight
LibreCAD
SketchUp
FreeCAD
Autodesk AutoCAD
BricsCAD
nanoCAD
QCAD
Checklist Design
Design Principles
Mobbin
Refero Design
5 Years of Design
UX Design Weekly
Laws of UX
Keep Design System
DraftSight
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LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
Design Principles - An open source repository of design principles and methods
SketchUp - 3D for Everyone
Mobbin - Latest mobile design patterns & elements library
FreeCAD - An open-source parametric 3D modeler
Refero Design - The biggest collection of UX Patterns, UI Elements and design references from great web applications