All premium plugins are now FREE.
Assignment, Multiple Forms, and Properties will soon be available on the wordpress.org plugin repository.
Meanwhile, you can download them here:
or fork them on GitHub: https://github.com/cdillon?tab=repositories
Are you a developer? Strong Testimonials and its add-ons are also available for adoption. Contact firstname.lastname@example.org if interested.
Thank you for your support over the past four years.