The RT Topology Library exposes an API to create and manage standard (ISO 13249
aka SQL/MM) topologies using user-provided data stores and released under the
GNU GPL license (version 2 or later).

The code is derived from PostGIS liblwgeom library enhanced to provide
thread-safety, have less dependencies and be independent from PostGIS release
cycles.

WWW: https://git.osgeo.org/gitea/rttopo/librttopo