verba.pl is a simple Perl library that uses a YAML data file to conjugate regular Latin verbs.
This example will fetch the first person plural active present form of amo:
my $basis = "am";
my $thema = $data->{VERBA}->{THEMATA}->{PRAES}->{1}; ## returns 'a'
my $termi = $data->{VERBA}->{TERM}->{ACT}->{PLUR}->{1}; ## returns 'mus'
my $respo = $basis . $thema . $termi; ## catenates the three substrings