Autodesk Meshmixer  

free software for making awesome stuff

https://www.meshmixer.com/

FreeCAD

FreeCAD: Your own 3D parametric modeler

FreeCAD 使い方メモ – XSim

(156) Asuna CAD Factory – YouTube

FreeCAD マウス操作の設定 – XSim

T001 FreeCADについて | など工 (enginfo.jp)

FreeCAD 使い方メモ – XSim

FreeCAD スケッチ|作図と幾何拘束と寸法拘束を初心者向けに解説 | コスモスデザイン (cosmosdesign2021.com)

BRL-CAD

BRL-CAD: Open Source Solid Modeling (brlcad.org

Librecad

Open Source 2D-CAD
LibreCAD is a free Open Source CAD application for Windows, Apple and Linux.

LibreCAD – Free Open Source 2D CAD

QCAD

QCAD – 2D CAD for Windows, Linux and Mac
The Open Source CAD System For Everyone

QCAD – QCAD: 2D CAD

JWW

Jw_cad超初心者道場 ~JWCADの使い方~ (jwdojo.com)

画面の色・線の色・線の太さを設定 – JWW の使い方 – Jw_cad 設備設計情報室 (setsubit.com)

JWW の使い方 – マウスの基本操作 – Jw_cad 設備設計情報室 (setsubit.com)

blender

 Home of the Blender project – Free and Open 3D Creation Software

https://www.blender.org/

eagle  

あらゆる設計者のための PCB 設計ソフトウェア

https://www.autodesk.co.jp/products/eagle/free-download

KiCad EDA  

 Schematic Capture & PCB Design Software

A Cross Platform and Open Source Electronics Design Automation Suite

https://www.kicad.org/

textures

https://www.textures.com/

thingiverse

https://www.thingiverse.com/

poliigon

https://www.poliigon.com/

cgtrader

https://www.cgtrader.com/

grabcad

https://grabcad.com/

onshape

https://www.onshape.com/

freecadweb

https://www.freecadweb.org/

draftsight

https://www.3ds.com/ja/products-services/draftsight-cad-software/

myhome-cloud.net

https://myhome-cloud.net/