I've been playing on and off with Godot, an open source 2d/3d game engine. I increasingly think that game engines offer the most exciting examples of new or more supportive/powerful desktop paradigms, particularly for personal software.
Masterplan, for example, remains one of the most striking personal project management tools I've ever encountered. If you've never seen it before, you owe it to yourself to see how it works, and how its designer, Solarlune, perceives the relationships between interface, animation and input: https://solarlune.itch.io/masterplan
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