draw.io - Online diagramming application
Mitchell 1 - Mitchell 1 is a leader in providing automotive repair software and repair shop solutions that simplify everyday tasks for automotive professionals.
Penpot - Design freedom for teams
Direct-Hit - Direct-Hit by Identifix delivers all data, tools and information necessary to help automotive repair professionals run their shops efficiently.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
AutoPlan - Automobile Repair and Maintenance Software