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Viking vs HoudahGeo: catalog facts
Viking	HoudahGeo
Free Free and open source under the GNU GPL.	Paid Paid app with a free trial.
Windows, Linux	macOS
Edits tracks, routes and waypoints in GPX, KML and TCX Shows OSM, Bing Aerial and other map layers	Several geotagging methods: GPX tracks, reference photos and maps Writes coordinates into the files themselves
Real-time GPS and Mapnik rendering are not available on Windows GTK interface looks dated on Windows	Mac only Paid after the trial
Downloadable app	Downloadable app
Open source	Closed source
License: GPL	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.