Procore - Procore is the world's most widely used construction project management software. Easy to use, mobile platform with unlimited user licenses.
draw.io - Online diagramming application
Knowify - For trade contractors and remodelers looking to run their businesses in a professional and modern way. All-in-one solution with real-time insights.
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.
CMiC - Cloud-based, single database PM and financials software
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.