draw.io - Online diagramming application
Fivetran - Fivetran offers companies a data connector for extracting data from many different cloud and database sources.
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.
Hevo Data - Hevo Data is a no-code, bi-directional data pipeline platform specially built for modern ETL, ELT, and Reverse ETL Needs. Get near real-time data pipelines for reporting and analytics up and running in just a few minutes. Try Hevo for Free today!
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Skyvia - Free cloud data platform for data integration, backup & management