There are many alternatives to diagrams.net as a self-hosted solution if you are looking for a replacement. The best Self-Hosted alternative is Penpot, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to diagrams.net and six of them are available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting Self-Hosted alternatives to diagrams.net are TiddlyMap (Free, Open Source), Wireflow (Free, Open Source), Kroki (Free, Open Source) and Hava (Paid).
Penpot is the first Open Source design and prototyping platform meant for cross-domain teams. Non dependent on operating systems, Penpot is web based and works with open web standards (SVG). For all and empowered by the community.
TiddlyMap is a TiddlyWiki plugin that turns your favourite personal note taking software in a wiki-concept-map hybrid! Yes, you will be able to do both: drawing maps and putting down knowledge in a wiki way.
Creates diagrams from textual descriptions! It provides a unified API with support for BlockDiag, BPMN, Bytefield, C4 (with PlantUML), Ditaa, Erd, GraphViz, Mermaid, Nomnoml, PlantUML, SvgBob, UMLet, Vega, Vega-Lite, WaveDrom.
Automatically generates cloud network topology diagrams for AWS, Azure and GCP. Visualizes cloud infrastructure, tracks versions, auto updates, generates compliance reports with on embed anywhere viewer and API access.