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.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Fullbay - Fullbay is built for HD repair shops & fleet managers. It improves tech efficiency, bills parts, and makes invoicing a snap.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Tekmetric - Tekmetric is an auto-repair shop management software that helps workers to inspect vehicles digitally, get repair orders, and maintain communications with their customers.