As part of a Soapbox update on September 10, 2015, the Salesforce Submit app was renamed Forms. This change was made in conjunction with renaming the Salesforce Search app to Directories. These changes were made for concision, to provide a more descriptive name for the apps, and to bring consistency to our naming conventions from both a product and marketing perspective.
In addition, the Salesforce packages supporting the Forms app have been renamed from “Soapbox Submit QuickStart for Salesforce” and “Soapbox Submit for Salesforce” to “Soapbox Forms QuickStart for Salesforce” and “Soapbox Forms for Salesforce”, respectively. This name change is visible in your Salesforce Installed Packages list, effective 9/11/2015.
So, not to worry! You still have your Salesforce Submit app with all of its features! It just has a shorter name!