Interesting that this thread mostly consists of people sharing vibe-coded projects they themselves made, not people sharing other people’s projects that they’ve found useful. The latter would provide higher confidence that the project is actually impressive. It’s the IKEA effect for software.
As for sharing a tool that someone else has made that's useful, I don't think most people are advertising that the tools they've built are vibe-coded, so it would be hard to know what to share.
I think Claude Code itself is mostly vibe coded if you consider that impressive. In general I’m not aware of any vibe coded projects with a substantial amount of iteration put into it rather than being close to one shot, which is why I shared mines. Any project someone can one shot is also something anyone else can vibe code for themselves.
What definition of "vibe coding" are you using here? I seriously doubt Claude Code was made "mostly" (or even "partly") by telling a prompt what they want, and accepting the output when it looks functionally acceptable without regard to how the code looks or works under the hood.
I don't know if or how you've been using AI for coding, but Claude Code is almost certainly being used to develop itself, and I have a hard time imagining their devs not having the best setup possible to make it as easy as possible for Claude Code to iterate on itself with minimal oversight. Once a codebase is well structured and you supply a well thought out meta prompt with something like CLAUDE.md, then there's no reason to check the code output/changes beyond a quick skim.