Hi,
I presume you are talking about the original Meraki Mini (or the
original Meraki Outdoor Mini, which is the same inside). I can't help
with adding applications to the Meraki firmware but the best approach
to flashing to the Open-Mesh combination of OpenWRT (plus Batman and
Robin) seems to be as described by William Rickman here:
http://ruckman.net/tech/2008/03/03/guide-to-flashing-a-merakiacctonfonero/
which tells you what to download as well as what to do. (Thanks,
William.)
In my experience using the Linux approach is best. I have found it
pretty reliable - but you MUST BE PATIENT as it takes ages, mostly
with no network activity.
The result is set to use the management facilities from
http://www.netequality.net/index.php though you don't have to do so.
To do so use the "Add Network" tab. Note that you must specify your
network type as
RO.B.IN, not MERAKI.
Alternatively I presume you could use the basic OpenWRT Kamikaze
firmware from the OpenWRT site.
Having got set up you can SSH in to your box and take things on from
there - i.e. remove Batman and Robin if you wish and add other
things.
Hope that helps.
Richard