This is sort of off topic, but recently I've been paying a service called www.directorymaximizer.com
about $100 to submit my new sites to around 1000 free directories. You don't actually end up getting 1000 directory listings. Not every directory accepts, in my experience. But you will get a few hundred (?) freebie listings.
If you're interested in seeing the sorts of listing you get, enter link:www.percheronhill.com
into Google. Most of those links are from the freebie directories.
Final comment: My experimenting suggests that in my categories I don't get much benefit from the free directories.