embeddable

draw.io

draw.ioOpen

Security-first diagramming online, on desktop, or self-hosted

draw.io is a free diagram editor for flowcharts, network diagrams, and whiteboards that runs in the browser, on the desktop, or self-hosted.

IronCalc

IronCalcOpen

Open-source spreadsheet engine and workbook editor

IronCalc is an open-source, MIT-licensed spreadsheet stack: a Rust engine with 200+ functions plus a browser app for .xlsx workbooks you can embed or self-host.