* [nerror v2.0.0](https://github.com/Netflix/nerror) – Fork of VError that provides rich JavaScript error classes with printf-style messages, cause chaining, and extra informational properties.

* [err2 v1.3.0](https://github.com/lainio/err2) – Go package for fully automatic error checking and propagation with deferred handlers, optional stack tracing, and assertion helpers.

* [slog: Echo middleware v2.1.0](https://github.com/samber/slog-echo) – Echo middleware that logs HTTP requests using slog.

* [Oops v1.23.1](https://github.com/samber/oops) – Go library for structured error handling with context, stack traces, and error chaining.