The human mind and anything with a keyboard. It wouldn't hurt to be a little more specific in your questions.
If you're referring to a tool that actually creates your content, please let us know if you find one. Otherwise, what D.O.Beast said, or maybe combine that with a curation tool.
Maybe this http://codecanyon.net/item/wordpress-automatic-plugin/1904470 in combination with this http://codecanyon.net/item/wordpress-auto-spinner-articles-rewriter/4092452 ?
Kindly don't use any tool to create content, use brain and write quality content,that will be helpful, then check content is duplicate or not, many tools are there to find duplicate content.
google 'rss aggregator', newsfeed aggregator' You can put a script on your site that reads those news and publishes them on your site
I like your post... Anything with a keyboard, great reply, man! I also think that manually is always the best way to do SEO (even content writing). Spun articles will more HURT your website than helping it gain a better position in the SE's...
There are many content creation tools but I suggest you to do handwritting. It's always the best from SEO and user experience point of view. If you make spam then you can go with spun, but try to avoid that.
Yes, Lift up your hands and grab your head. Now shake it real hard, your content creation tool is in there.