(I explain and link to the ones that I don't think everyone here would know about)
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Lemmy
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ActivityPub
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Firefox (Chromium should go the way of IE)
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Godot
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WINE
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Cinnamon (the desktop environment developed for Linux Mint, so we can get Wayland support)
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Box86/Box64
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Darling (macOS compatibility layer for Linux, plans to support running iOS apps when running on on ARM machines in the future, I want this primarily for iOS preservation purposes)
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Xemu (Original Xbox emulator, OG Xboxes are some of the most failure prone consoles and a game I want to play still has serious issues)
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Haiku (mostly for really nerdy shits and giggles honestly, but there's a part of me that thinks it could be a better consumer grade FOSS OS than GNU/Linux if it were more developed and had any actual software support. As it stands, like it's proprietary predecessor BeOS, it's just a toy. It's no less stupid than investing your theoretical time in Hurd IMO)