Placemark is now fully open source
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https://macwright.com/2026/08/25/placemark-fully-open-source
Placemark is a tool that lets you view, create, and edit geospatial (map) data. I ran it as a company for a while and open sourced it when I shut down that company.
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I don’t know what the reasons are for the company going bottoms up, but I hope the developer can sustain themselves otherwise and continue making opensource contributions.