This is GLib.   

GLib is the low-level core library that forms the basis for projects
such as GTK+ and GNOME. It provides data structure handling for C,
portability wrappers, and interfaces for such runtime functionality as
an event loop, threads, dynamic loading, and an object system.

In this directory you will find:

2.10/      Old Stable Series GLib 2.10
2.11/      Old Development Series GLib 2.11
2.12/      Stable Series GLib 2.12
2.13/      2.13 development series
2.14/	   2.14 stable series 	
2.15/	   2.15 development series
2.16/      2.16 stable release
2.17/      2.17 development series
2.18/      2.18 stable series
2.19/      2.19 development series
2.20/      2.20 stable series
2.21/      2.21 development series
2.22/      2.22 stable series
           and so on...

Note that older versions of GLib can be found in the directories
below ftp://ftp.gtk.org/pub/gtk.

The official ftp site is:
  ftp://ftp.gtk.org/pub/glib

The official web site is:
  http://www.gtk.org/

A mailing list is located at:
  gtk-list@gnome.org

To subscribe: mail -s subscribe gtk-list-request@gnome.org < /dev/null
(Send mail to gtk-list-request@gnome.org with the subject "subscribe")