* [node-geo-tz v8.1.6](https://github.com/evansiroky/node-geo-tz) – Node.js package for accurate geographical timezone lookup based on GPS coordinates.

* [TZF v1.0.4](https://github.com/ringsaturn/tzf) – Fast Go library to find timezones from latitude and longitude.

* [Timezone Boundary Builder 2026a](https://github.com/evansiroky/timezone-boundary-builder) – Tool that extracts OpenStreetMap data to build worldwide timezone boundary shapefiles.