I'd like to nominate miette, a new crate for error handling and reporting that's a mixture of thiserror, anyhow/eyre, and codespan-reporting, all in a nice neat package. It adds stuff like unique error codes (with automatic linking to docs-rs), help messages, footers, multiple messages, and even snippets.
I just tagged 3.0.0 and I'd love to get some more attention on it!
Here's what an example error looks like:
