drawDB is a free, open-source online database schema design and ER diagram tool. It supports drawing ER diagrams, generating SQL for PostgreSQL, MySQL, SQLite, SQL Server and Oracle, and real-time collaboration. The editor runs in the browser with no account required, and Pro adds cloud storage, teams and collaboration.
ArrayCat is a browser-based tool for converting strings, lists and CSV columns into PHP, JavaScript, Python, Go, Delphi and Pascal arrays, JSON arrays, MySQL inserts or plain lists. It can remove duplicates, empty items and diacritics, sort lists, change letter case, normalize whitespace and encode Base64. Input is processed in the browser and not uploaded.
The Data Visualisation Catalogue is a project by Severino Ribecca that provides a non-code-based library of information visualization types. The site serves as a learning and inspiration resource, offering a searchable guide to chart methods such as bar charts, heatmaps and treemaps. Example images mostly use dummy data.
Flourish is a storage, design, or frontend resource for mockups, assets, UI tools, or web search.
Dia is free, open-source drawing software for creating structured diagrams. A Windows version is available as a free download, and the download page also provides packages for Mac OS X and Linux. The software is released under the GNU General Public License, GPLv2.
Swimlanes.io is a free webapp for making sequence diagrams. Users edit text and the diagram updates in real time. Diagrams can be downloaded as images or shared with a link, and the URL changes whenever the diagram is updated.
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams. It supports diagram types including sequence, use case, class, object, activity, component, deployment, state and timing diagrams, plus non-UML diagrams. Images can be exported in PNG, LaTeX, EPS and SVG.
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ArrayCat is a browser-based tool for converting strings, lists and CSV columns into PHP, JavaScript, Python, Go, Delphi and Pascal arrays, JSON arrays, MySQL inserts or plain lists. It can remove duplicates, empty items and diacritics, sort lists, change letter case, normalize whitespace and encode Base64. Input is processed in the browser and not uploaded.
The Data Visualisation Catalogue is a project by Severino Ribecca that provides a non-code-based library of information visualization types. The site serves as a learning and inspiration resource, offering a searchable guide to chart methods such as bar charts, heatmaps and treemaps. Example images mostly use dummy data.
Flourish is a storage, design, or frontend resource for mockups, assets, UI tools, or web search.
Dia is free, open-source drawing software for creating structured diagrams. A Windows version is available as a free download, and the download page also provides packages for Mac OS X and Linux. The software is released under the GNU General Public License, GPLv2.
Swimlanes.io is a free webapp for making sequence diagrams. Users edit text and the diagram updates in real time. Diagrams can be downloaded as images or shared with a link, and the URL changes whenever the diagram is updated.
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams. It supports diagram types including sequence, use case, class, object, activity, component, deployment, state and timing diagrams, plus non-UML diagrams. Images can be exported in PNG, LaTeX, EPS and SVG.
