The PlantUML plugin for Obsidian allows users to render PlantUML diagrams directly within their notes. This plugin uses either the online PlantUML server or a local .jar file for rendering, providing flexibility in terms of performance and customization. Users can create fenced code blocks using `plantuml` as the language and specify their PlantUML code inside. The plugin also supports linking to other notes in the vault, including ASCII art diagrams. With this plugin, users can easily integrate visualizations into their notes, making it an excellent tool for creating interactive and engaging content.

The Circuit Sketcher plugin allows users to create and edit circuit diagrams directly within Obsidian. With a responsive canvas interface, it supports saving and loading designs, customizing circuit elements, and managing a reusable library of components. Users can easily connect nodes, add ports, and label elements for detailed circuit layouts.