GLib (not to be confused with glibc) from the GNOME project has a wide range of functionality -- generic lists, hash tables, strings etc.: <a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;GLib" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;GLib</a><p>Qt, I believe, also comes with a bunch of &quot;standard library&quot; stuff unrelated to UIs.