Multiple Integrations of the different kinds on a single Form
Yes -- You can add as many different integrations as you'd like to a single Form. For example, if you wanted to add a PayPal, Salesforce, MailChimp, and Zendesk to a single Form.
Multiple Integrations of the same kind on a single Form
Workaround needed -- Currently, you cannot add the same integration type to a single form. For example, you would not be able to add the Salesforce integration more than once to a single Form. Once the integration is added, you will be prevented from adding this same integration to the same Form.
As a workaround and depending on the integration type you are using, you may be able to use Zapier to create multiple Webhooks for the same integration and send submitted Form data to multiple instances of your integration.
Different Integrations with different credentials across your Account
Yes -- You are able to use multiple integrations with various login and access credentials on different forms in your Account. Each time you add an integration to a Form, you will be prompted to enter your integration credentials. Here you can connect to any of your third-party integration accounts.