Quite a few I bet. Adding further words to narrow down exactly what it is that you want to find free but you'll still get swamped with replies. Imagine if your web site was one of those relying on 'free' to get hits. You'll be waiting a long time. Now just take a minute to analyse some of these so-called free services being offered by these sites.
Software is a prime example.
Some software appears to be free but is actually license restricted in some way. Quite a bit of free content is used as a hook to purchase such as a free quote or a free consultation which would be offered in any case. Using free is misleading bcause it only serves to make searching web content that much more difficult. You will not find a single reference to free anywhere on this web site. What I am offering IS free but putting that into meta tags will not make much difference to my already meagre hit count.