I have tried my best to compile the optimum Free Directory Submission Websites list although I know you will find on many websites.
I have actually included some of the best blog directories, web directories, add URL and link exchange websites. I hope it would be useful for you and would help your websites or blogs to rank high thereby leading to a higher page rank.
I would also like to tell you that there are different and mixed views on Free Directory Submission regarding seo and pagerank and so it is not certain if it actually helps to increase page rank or not but it will definitely bring some traffic to your website or blog.
It is also advised by many seo experts to stay away from link exchange and link farming websites or directories but then I have given you the resource and it is absolutely your sole decision whether to use it or not.