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The same person also did geojson.io, which is a wonderful tool I use occasionally. Great for testing geojson. It's a pity placemark did not make it as a company but fantastic it's now open sourced.

The people at geomob did an interview with Tom MacWright two years ago or so on their podcast: https://thegeomob.com/podcast/episode-118 when he just launched placemark.

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I can’t believe I’m saying this but: I wish they had placed an ad for placemark on geojson.io.

I had no idea this existed until just now but I’ve worked at two companies where a lot of coworkers could have benefited greatly from a map app that has a few more features than geojson.io but is less complex than qgis/arcgis.

geojson.io is owned & managed by our former employer, Mapbox, where Tom built it originally some years ago, whereas Placemark was an independent project by Tom.

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