The following third party tools all work with OptimizePress™. You can use them in various ways to make the most of OP.
OfficeAutoPilot – Fully automated CRM plus email marketing plus shopping cart plus lots more.
Aweber – Email autoresponder that is one of the simplest and best tools available at a very reasonable price. I use this myself.
LeadPlayer – Enhance the videos you embed on your website with call-to-actions and opt-ins
WordPress.org – You will need a self-hosted WordPress website to run OptimizePress on.
I will add more 3rd party resources that you can use with OptimizePress™ as and when I use/review them.