identi.ca existed before autonomo.us, but Evan was very much involved with and inspired by the movement, and identi.ca was motivated by a will to offer a service that complied with the nascent Free Service recommendations that would become the Franklin Street Statement. You will see him below endorsing the FSS and be listed as a contributor to the OSSD.
Didn't look at http://opendefinition.org/ossd/ before, but it says pretty much the same as the FSS, partly stricter, partly looser. They misspelled Evan's last name. :-)