How to make multi-select, aucomplete combo box like in Atlassian Jira [closed]

Question

I like GUI and controls of Atlassian Jira. In particular they have cool multi-select combo control. I need to implement similar control on my site.

I am using jquery-ui.

What library do they use? What license?

Can I find it somewhere as JScript?

Is there anything similar free or commercial?

Developer website with demo: http://www.atlassian.com/software/jira/tour/

UPDATE SAMPLE IMAGE

Answer 1

You can also check this select2