This is old hat but you will be amazed at what you can find free using Google. I thought we could have a thread just for this.
Code:
https://www.google.com/search?q=intitle:%22index+of%22+%22parent+directory%22+PLR+-pool+-pdb+-rpm+-postgresql++rar+OR+zip&num=100&hl=en&safe=off&filter=0
If anyone has any more useful searches please feel free to share.
Very Cool! Old'ie but a good'ie
And Ya, A Ton of stuff!
Gotta love thous search quire operators 
Hulk, I am all out of Rep's for the day... 
Rain Check? 
Nice trick thanks
+ + + Rep added
Very Nice.
For those that don't know, you can drill down the parent directories and find more sub-directories to explore.
I also changed the term parent in the search string for different results.
Thanks OP - repped!
I would like to see a regular thread for stuff like this too.
just had to give you a +rep dude! thanks
nice method, thanks HULK!
+3 rep
Is there any way that one can see the site files in the root of a website?