[tmandry]

Most libraries don’t target nightly anymore. It certainly used to be the case that nightly had all the cool features everyone wanted, but almost all features that popular crates depended on have now been stabilized. Even Rocket (the most high-profile holdout I know of) now works on stable as of earlier this year.

As for maintenance, as with all library ecosystems it’s a mix. The most popular crates tend to be the most well-maintained in my experience. This is definitely something to consider when taking on new dependencies.