Hello,
if you have a J-Link (perhaps from a starter kit) and want
to use it with a free ARM toolchain, take a look at my tutorial:
http://www.yagarto.de/howto/jlink/index.html
The SAM-ICE is coming with a full GDB Server license and works
only with Atmel devices.
The J-Link software 3.64a and above comes now with a free
GDB Server for non-commercial purposes. This GDB server
is limited to 32KBytes download size and works with all ARM cores.
I have created some very small examples to show how to
debug your application with Eclipse or Insight.
Best regards,
Michael