Square - Square helps millions of sellers run their business-from secure credit card processing to point of sale solutions. Get paid faster with Square. Sign up today!
draw.io - Online diagramming application
Lightspeed - retail and restaurant point-of-sale, ecommerce, and omnichannel solution
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.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.