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dbdiagram.io lets you design database schemas by writing a simple DSL (DBML) and instantly see the entity-relationship diagram. It can import from or export to SQL for Postgres, MySQL, and other databases.
Mermaid lets you generate flowcharts, sequence diagrams, Gantt charts, and more from simple Markdown-inspired text syntax. It's widely supported in docs tools, GitHub, and note-taking apps, so diagrams stay easy to version and update.
D2 is a modern diagram scripting language that turns plain text into clean architecture, sequence, and flow diagrams, with a live playground, autoformatter, and SVG/PNG/PDF export.
Free virtual whiteboard for sketching diagrams and wireframes collaboratively with ease.