how to share all submissions

It depends on how you would like to share the submissions. 

You can actually share the submission data of your forms to the public or to anyone that have link to it even to non JotForm users.

Please refer to the user guide:   -How-to-Share-Form-s-Submissions-Page

You can provide an access password to the link 

so it is also safe.

There are several different types of reports that can be created:

https://www.jotform.com/help/326-How-To-Create-Form-Reports-in-JotForm

You can even combine submissions from multiple forms into a single CSV file:

http://apps.jotform.com/app/combine_submissions