example of layered software?

I wrote a tool to check architecture, and I wan't to test it on real projects.
This is why I am looking for Ada (and Java/C/C++) sources that have a layered architecture, and describe it.

Here is an example from GtkAda documentation :

+---------------------------------------------+
|             Your Application                |
+---------------------------------------------+
|                 GtkAda                      |
|               +-----------------------------+
|               |            GTK              |
|       +-------+-----------------------------+
|       |           GDK                       |
+-------+--------------+--+-------------------+
|          GLIB        |  | X-Window / Win32  |
+----------------------+  +-------------------+

I would apreciate something more simple (without bridging), but here is the idea.

Note that I'll release the tool as free software.

Thank you for your help.

--
Lionel Draghi
.

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