GIS software, OS OpenData, INSPIRE polygons and UK map viewers. 5 tools, in our suggested starting order (how we order).
ordnancesurvey.co.uk
Ordnance Survey's free datasets for Great Britain (mapping, boundaries, terrain, rivers, postcodes) under the Open Government Licence.
Best for Surveyors needing free GB base data.
Cost Free under OGL (stated on page).
Visit siteSource · checked 15 Oct 2026
use-land-property-data.service.gov.uk
Indicative positions of registered freehold titles in England and Wales, updated monthly, GML.
Best for Land surveyors checking indicative title extents.
Cost Free under OGL (GOV.UK guidance).
Visit siteSource · checked 15 Oct 2026
gridmarks.co.uk
Free UK survey map in the browser: plot site marks from an OS grid reference, easting/northing, lat/long, postcode or an Excel/CSV import, then plan the day's visits, export to Excel and save council areas for offline use.
Best for UK surveyors marking, planning and revisiting site locations.
Made by the same person who runs Surveyor Stack (Mark Slater). Listed on the same terms as every other tool: no seeded votes and no boost in the order.
Cost 'Free · no login' stated on site (checked 15 Oct 2026). Site says a future Pro plan may focus on team workflows and 'nothing is locked today'.
Visit siteSource (home page and page description) · checked 15 Oct 2026
osdatahub.os.uk
Ordnance Survey's portal for data downloads and APIs; OpenData, Premium and Public Sector plans.
Best for Surveyors and developers using OS data.
Cost OpenData plan free; Premium plan includes £1,000 of free API transactions a month (stated on page).
Visit siteSource · checked 15 Oct 2026
qgis.org
Free and open-source desktop GIS.
Best for Anyone working with UK spatial data.
Cost Free and open source, GNU GPLv2 (stated on site).
Visit siteSource · checked 15 Oct 2026
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