Diagram generator
https://github.com/ArthurSonzogni/Diagon
dbdiagram.io - Database Relationship Diagrams Design Tool
シンプルなテキストファイルで UML が書ける、オープンソースのツール
mermaid - Markdownish syntax for generating flowcharts, sequence diagrams, class diagrams, gantt charts and git graphs.
https://whimsical.com/flowcharts
https://diagrams.mingrammer.com/
Alexis-benoist/eralchemy: Entity Relation Diagrams generation tool
Google slide
Diagram Assets - Google スライド
AWS Simple Icons v2.1 - Google 図形描画
ASCIIFlow
draw.io
How to display Directory & File structure in Markdown Files | bobbyhadz