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You can read some of Carmack's plan files (blogs before blog was coined) for some insight into this, but basically he does it because he learned to code by reading other people's code, and so wants to help the next generation of programmers get started too
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It does work for a game, i. e.: shapez.io is under GPL3 but also is being sold on Steam
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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shapez.io
shapez.io is an open source base building game inspired by factorio! Available on web & desktop (by Sense101)
It does work for a game, i. e.: shapez.io is under GPL3 but also is being sold on Steam
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Piling on: Mindustry is another GPL3 game that is available on Steam as well as several other platforms.
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Selling GPL software can also work if you have enough momentum and target non-technical users. aseprite is a source-available sprite editor where it's possible and allowed for someone to compile the product themselves. Their license mentions:
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It used to be GPLv2, they changed the license, and now there's an open source fork LibreSprite. You can read about the change here.
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Then you may find this Python package amusing.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.