Sugar consists of several parts:
Sugar dependencies
The Sugar interface is based on the GNOME and freedesktop software stacks, using technologies like Gtk+, dbus, xorg, matchbox-window-manager and gconf. It is written in Python, making it easily extended. For the collaboration part, Sugar is using the telepathy framework.
The activities depend on technologies like xulrunner for the browser, abiword for the write activity and squeak for etoys.