draw.io - Online diagramming application
CMiC - Cloud-based, single database PM and financials software
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.
Infor Construction - Infor Construction provides the accurate information you need to manage your business more efficiently and profitably.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Aconex - Aconex is a cloud-based construction management platform.