My colleagues reminded me that we can use the FastAlign package ( https://github.com/clab/fast_align ) as an alternative to GIZA++. FastAlign implements a modification of the IBM Model 2 algorithm to produce word alignments (paper here: http://www.aclweb.org/anthology/N13-1073.pdf ). It's Apache 2 licensed and I believe it should perform the same basic functions as GIZA++ (correct me if I'm wrong Matt). I've been using it on my project to generate alignments and haven't had any issues.
-Kellen
