Requires X windows to display plots.
You will first have to rebuild binutils and change
#define MAX_NR_GOT_HOLES 8192
to
#define MAX_NR_GOT_HOLES 100000
in bfd/elf32-avr32.c (somewhere around line 249)
Then you can build ngspice.
* ngspice-rework-17-avr32-bin.tar.bz2: ngspice binaries for AVR32
* Screenshot from NGW100: