If you're willing to settle for a client-side only web frontend (i.e. talks directly with APIs of the models you use), TypingMind would work. It's paid, but it's good (see [0]), and I guess you could always go for the self-hosted version and wrap it in an Electron app - it's what most "native" apps are these days anyway (and LLM frontends in particular).

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[0] - https://news.ycombinator.com/item?id=41988306