A very simple tool that lists the external (non-stdlib) dependencies of a Go package.
Examples:
$ deplist github.com/jmoiron/sqlx
github.com/jmoiron/sqlx/reflectx
$ deplist -t github.com/jmoiron/sqlx # -t to show test dependencies
github.com/go-sql-driver/mysql
github.com/jmoiron/sqlx/reflectx
github.com/lib/pq
github.com/lib/pq/oid
github.com/mattn/go-sqlite3
github.com/mattn/go-sqlite3/sqlite3_test
deplist -h shows usage info.