Automatic url submission tools?

[Darek]

I wanted to write a post on my blog about some of the best free automatic link submitting tools, but I find it quiet hard to find them since all of them are paid - I found few but that's not enough to write a long article so I thought maybe someone here know any tools like this.

I don't want tools that submit your site to FFA sites, only sites like RSS directories, bookmarking sites etc.

I appreciate any answers