Top ranking websites with the keyword uml in the domain name.

plantuml.com

PlantUML : Open-source tool that uses simple textual descriptions to draw UML diagrams.

uml.edu

UMass Lowell | UMass Lowell

staruml.io

numl.edu.pk

umllb.com

kuonitumlare.com

puml.io

uml-diagrams.org

Unified Modeling Language (UML) description, UML diagram examples, tutorials and reference for all types of UML diagrams - use case diagrams, class, package, component, composite structure diagrams, deployments, activities, interactions, profiles, etc.

cpnuml.org

|| Communist Party of Nepal (Unified Marxist Leninist)||

lirumlarumleg.dk

umland.com.my

UMLand: Property Developer of Distinction

uml.org

Unified Modeling Language (UML)

zukunftsraumland.at

buxumlunic.ch

umlub.pl

Uniwersytet Medyczny w Lublinie