Nintex for Office 365 empowers your team to automate their own processes through intuitive, browser-based, drag-and-drop workflow and forms designers built for the Office 365 platform. Build workflows and forms that connect and interact with your existing Office 365 applications. Integrate your workflows with cloud services such as Adobe Sign, DocuSign, Dropbox, Yammer, and Twitter. Surface your process through powerful forms that are available wherever you work, whether that's the web or a mobile device. Build forms in Office 365 without code, customizing branding and presentation logic and connecting the forms with your workflows.
You will need an Office 365 subscription that includes SharePoint Online, and supports the SharePoint Online App Model, as well as Workflow Manager. All of the Office 365 Business subscriptions will satisfying these requirements, and if you do not have a subscription, you can sign up for a 30-day trial directly from Microsoft at http://office.microsoft.com/business.