PlantUML
PlantUML is an open-source tool that allows developers to create UML (Unified Modeling Language) diagrams from a plain text language using simple and intuitive syntax. It supports various diagram types such as sequence diagrams, class diagrams, use case diagrams, activity diagrams, and more, enabling visual representation of software designs and processes. The tool generates diagrams in formats like PNG, SVG, and ASCII art, making it easy to integrate into documentation, wikis, or code repositories.
Developers should learn PlantUML when they need to quickly create and maintain UML diagrams for software design, documentation, or communication purposes, as it automates diagram generation and ensures consistency. It is particularly useful in agile development environments, for documenting APIs, designing system architectures, or visualizing workflows, as it allows diagrams to be version-controlled alongside code and updated easily with text changes.