Opentick.com is NOT free.
For example to view ES (S&P mini futures/Globex) you pay $20 monthly. With level II it's $40
But for years of histrocial tick data (Level II included!) $40 looks very cheap. I think you may download the whole database within a month...
I am not using this service so if I read the things wrongly or dont know what I am talking about please correct me
btw. You can download last 5 days tick data directly from the CME's FTP server ftp://ftp.cme.com/pub/gtime/
For example to view ES (S&P mini futures/Globex) you pay $20 monthly. With level II it's $40
But for years of histrocial tick data (Level II included!) $40 looks very cheap. I think you may download the whole database within a month...
I am not using this service so if I read the things wrongly or dont know what I am talking about please correct me

btw. You can download last 5 days tick data directly from the CME's FTP server ftp://ftp.cme.com/pub/gtime/