There are a lot of article resources online.
Ezinearticles.com is one of the most popular database of articles. You can use articles you find there within your spinning software. Don’t forget to mention the source of the content.
PLRnew.com is a rising star in the content arena. Not only can you find tons of free-to-use PLR articles on PLRnew.com, but you can also hire them to do all of the rewriting for you.
Plrplr.com is another Private-label-rights article database, accessible to everyone for free.