Fukufu is a small piece of sofware written in C++. Its purpose is to calculate the Fukui function and other reactivity indexes from Gaussian outputs.
A Gaussian (preferably 09) single-point open-shell calculation is needed, run with "pop=full iop(3/33=4)" options. Then run with:
./fukufu.o gaussian_log_file.log
An output containing several reactivity indexes will be created.
Just compile the code with the following command line:
g++ src.cpp -o fukufu.o -std=c++11
g++ may be replaced with you favourite c++ compiler.