Would you consider Wikipedia as the OG open-source product? If so I think they've done a terrific job
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From the list i also prefer Hanko, the design is really nice and clean.
Also Krita is a nice open source alternative to Photoshop.
I don't want to promote my own product, but for a machine vision application, where most of the time they are too complex to keep the design simple, i think AyBorg is well designed.
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Documenso
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Dub
Documenso
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Narrated Tours (On Demand Audio Guides)
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not 100% sure @Figma is open-source, is it? @Penpot looks like a beautifully designed, open-source alternative tho.
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ILLA Cloud
Juspay Hyperswitch
I am technically promoting here, but have you guys checkout @Juspay Hyperswitch