Mermaid
Mermaid project (Knut Sveidqvist and contributors) · Design & prototyping
JavaScript library that renders flowcharts, sequence, class, state, ER, Gantt and other diagrams from a Markdown-like text syntax
MITOpen sourceFreeLocalNov 2, 2026
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OpenStreetMap
OpenStreetMap Foundation · GIS & mapping
Collaboratively edited world map database released under the ODbL, with planet files, an editing API and derived tiles and extracts
ODbL-1.0FreeSelf-hostedNov 2, 2026
Overpass API
Roland Olbricht and the OpenStreetMap community · GIS & mapping
Read-only query service for OpenStreetMap data using the Overpass QL language, available on public instances or self-hosted
AGPL-3.0-onlyFreeOpen sourceSelf-hostedNov 2, 2026
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