online tool for managment scrum team

We used Version 1 in the past, currently used JIRA.

CA Agile Central, formerly known as Rally, seems quite popular.

Also, Scrum is a framework, not a methodology. 

I am a Computer Science teacher.  Scrumwise.com offers free educational licenses, so that is what I use in class, FWIW.

thanks both, i was wrong... the title is "agile methodology for an innovative startup".

We currently use JIRA.

JIRA would do the trick, I use it as a PO with a distant dev team. Stories/burn down chart etc are available. 

NB : don't forget the R of Scrum :)

You might also find real user reviews for these are other major agile development tools on IT Central Station to be helpful.

As an example, this user writes in his review of CA Agile Central, "It allows for the creation and scheduling of detailed user stories including attachments, assigned tasks, discussions, child stories, and revision history." You can read the full review here.

Good luck with your search. 

Hi Giacomo,

JIRA is "popular" among enterprises but I don't see the worth of paying for the license fee for a school project. I recommend to you taiga.io which is open source and well not so heavy as JIRA or others. taiga is the best hidden secret out there!  just download it and set it up in your own server or use their server for free for up to one project. You can pay as well to support them "to help keep them off the streets" as they say if you want.