I use Visio when I need to do flowcharts/UML/etc. If you're doing it for code, Rational can look at the code and build inheritance diagrams for you.

Dia is an application designed for quick creation of structured diagrams such as simple, line-based illustrations, flowcharts, UML charts and network diagrams. Being a vector based tool, there is some ...

The flowchart is a subtle way of representing a process or an algorithm for effectively analyzing the workflow. Flowcharts are extensively used in organizations and institutions to represent a ...

TL;DR: For $9.97 (MSRP $249.99), you can grab a lifetime license to Microsoft Visio 2021 Professional—perfect for creating ...