We are working on prioritizing and filling user requests. We would love to get a better feel for which services have the highest demand for easy integration with Formidable Forms. We have added a Zapier WordPress integration, and removed all requests that can now be done through the Zapier API.
Update 10/15/2018: More great news. The Constant Contact plugin for WordPress is ready.
Update 9/6/2018: Check out the GetResponse WordPress integration.
Update 9/4/2018: Download the HubSpot WordPress integration.
Update 7/5/2018: Our ActiveCampaign integration has been released.
Update 6/5/2018: Using MailPoet? Try our MailPoet WordPress newsletters plugin.
Update 5/31/2018: The Salesforce integration is ready.
Update 5/6/2016: The first of a couple Authorize.net add-ons is ready! This one covers one-time credit card or eCheck payments.
Update 4/26/2016: Stripe integration is now available!
Update 1/10/2016: A WooCommerce integration has been released. A third-party has developed another version as well with all the features you would want for creating products from the front-end.
Update 3/31/2014: Integration with Zapier has been completed. You can now send your entries to Constant Contact, Campaign Monitor, Salesforce, Mad Mimi, Google Drive, Google spreadsheets, Twitter, Facebook, Dropbox, and more.