aziton1

Hello every1

I need to know what do you call this script:
ultimate-guitar.com
not the whole script just the area where there are letter and search engine so we can add stuff like tabs (guitar music notation)
more accurate examples:
A-Z Guitar Tabs - ( 200,000 TAB ARCHIVE )
Guitar Tab Universe - Welcome to guitartabs.cc!
All Guitar Tabs

what is the name of this script or the scripts look like it?

also is there a free one (open source)? if not is there any script looks like it so I can edit it to fit my needs?

please help me

thanks in advance