nauty

Automorphism groups of graphs and digraphs
http://pallini.di.uniroma1.it/

Current versions
26r5

Recent formula history

Viktor Szakats nauty: secure url(s)
Jonathan Chang nauty 26r5
Xu Cheng remove root_url in bottle block
Ian Lancaster nauty: style nits
Bertrand Caron nauty 2.5r9

Formula code at GitHub