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This is amazing, thanks for open sourcing it!!

I own the domain chattymaps and have been planning to do a map based chat app on there - maybe digging into placemark will spur me on todo that.

Great news! It could totally look like a G Suite app.
This is different from a project that was started as open source without any company backing. Without a company backing it it likely won't survive.
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.

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.
I've seen a lot of these generic GIS tools.

the problem is ArcGIS is so prevalent and invasive in work flows that the remaining work and workers simply aren't substantial enough.

a product like this needs a ecosystem and a "killerapp" to really thrive.

you mistake "lockin" for competition. GIS will always be niche. There is no reason not to use standards for GIS, and open source has a place in the long term.
the point is ArcGIS simply as first right of refusal for almost any significant workflow.

certainly GIS outside of this is valuable but it's within a specific project specific world that it's a component of and not the central hub

maybe people are trying to build a better alternative to arcgis? and to do this, maybe you start with a simple app first? and perhaps these people are also experts in gis? crazy to think about
oh I agree, I run QGIS and Postgresql with PostGIS. I switched my entire work flow out of ArcGIS in 2016 because ArcGIS Pro was heading to LaLa land with it's online subscription garbage.

But, my point is: If you're goin gto compete with ArcGIS, it's going to come from the spokes to the hub, and not from the hub to the spokes. That is, you need a killer app for a very specific work flow and go from there into a ecosystem.

Without a "killer app", trying to build a separate hub and market that as-is just won't sell.

Can you point to a few successful worked examples of "spokes-to-hub"?
well, Google was a search engine.

Facebook was a college phone book.

Electron was propelled by multiple killerapp, initially by GitHub as Atom. it wasn't originally a standalone.

ArcGIS was also pretty niche until it gained the user base.

I wish I had a use for this, GIS tools usually don't have such a level of polish and intuitiveness. I could maybe see building a capable data viewer on Placemark as a base, but I would be ignoring half its features at that point.

Since this was a commercial product for some time, I'd love to hear some user anecdotes: What did they use it for? Did Placemark replace some existing tool, or was it used for new kinds of tasks?

would be interesting to find some mutualisation with umap-project.org ... or at least become a friend project :)