I'm working on a console-based RSS client in Haskell. The original plan was to implement the basic functionality of Newsboat (which currently is being rewritten from C++ to Rust).
It's still raw, but I already started using it as my primary RSS client. Right now it can fetch feeds, display them in a nice menu, maintain read status, open urls in a browser. The next features I'm going to add are support for configuration files (everything's hardcoded now) and tags + filtering.
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Newsboat had a few problems inherent to C++ (like occasional segfaults) and the TUI library it used. Knowing about these, I started googling for alternatives written in a higher-level language. And spotted the announcement [1] of the Newsboat author, saying that he's going to rewrite Newsboat in Rust. When I read that, the rewrite was already going on for months with still no end in sight. I thought, "Heck! I can implement this in Haskell in a few days!" By now I spent about a week of full-time work on the project (spread over months), and got a bare working prototype.
My estimate was too optimistic, of course, I didn't foresee all the difficulties I encountered later and all the things I had to learn. But still, I think if I spend one more week on this, I can get a fully-featured and polished RSS client — Haskell makes programming a lot cheaper.
