SLIB has a glob implementation written in pure Scheme.
<https://github.com/taktoa/slib/blob/master/glob.scm>. Copyright (C)
1998 Radey Shouman. The license is a custom-written; it looks like it
has the same conditions as a standard BSD license.

Gauche also ships with a BSD-licensed glob implementation in Scheme
written by Shiro:
<https://github.com/shirok/Gauche/blob/master/lib/gauche/fileutil.scm>

Glob has been voted out of this SRFI (IMHO the right choice), but it
would be good to get tried and tested implementations into package
managers like Snow and Akku.