Perpetual Mass Enrolments

The Redemptorist
Annual or Perpetual enrolment for masses to be said for living or deceased.

Basilica of Saint Francis of Assisi
Masses for Special Intentions; Perpetual Masses and Gregorian Masses

Capuchin Friars Australia
Seraphic Mass Enrolment, living or deceased, individual or family.

Here are a few free purgatorial societies you can enrol your deceased loved ones in 

ePurgatory

Friends of the Suffering Souls

Purgatory Project (for living as well)

And the Rorate Caeli Purgatorial Society 

For more perpetual mass enrolments online see this site