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I've worked extensively with materialize, which has been a similar experience to bootstrap.

Skeleton seems unmaintained. https://github.com/dhg/Skeleton

Yes it seems so. But there are forked repositories that are being maintained. They are

1. Skeleton framework (https://github.com/skeleton-framework/skeleton-framework) and

2.Skeleton Plus (https://github.com/oltmannsdaniel/skeleton-plus)

I like skeleton plus because of the responsive menu. The colours are not so good :P

Skeleton isn't a framework. It was a set of opinionated CSS styles and a basic grid built by one guy. It's been unmaintained for years but it still works fine. This is my favorite fork of it- https://github.com/whatsnewsaes/Skeleton-Sass