xbee-comm by Joshua Roys <roysjosh@gmail.com>
patches for macosx support by Bernard Pratz <guyzmo{at}leloop{dot}org>

  git://github.com/roysjosh/xbee-comm.git
https://github.com/roysjosh/xbee-comm
  irc://irc.freenode.net/#xbee-comm

Build instructions:
xbee-comm$ autoreconf -vi .
xbee-comm$ ./configure
xbee-comm$ make

In order to access the xbee as a regular user, you could do the following:
# setfacl -m u:$USERNAME:rw /dev/ttyUSB0

On MacOSX, please use /dev/cu.usb* instead of /dev/tty.usb* to access the
serial device where your XBee is plugged into.

Firmware files can be downloaded from digi:
  http://www.digi.com/support/productdetail?pid=3430&type=firmware
  ftp://ftp1.digi.com/support/firmware/

If you had a Series 2 XBee, you could do something like the following:
$ wget http://ftp1.digi.com/support/firmware/82001817_F.zip
$ unzip 82001817_F.zip
$ xbfwup [args...] ebl_files/XB24-ZB_21A0.ebl
Entering AT command mode...
Entering bootloader...
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Beginning programming...
Read 100224 byte firmware file (783 blocks).
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Waiting for upload confirmation...
Programming complete, running uploaded firmware...