Guest blogging is a marketing tool where advertisers, marketers or other bloggers publish blog posts on blogs they do not own. This way, the blog-site gets links, sales, subscription, web traffic, social votes, comments, visibility and much more. If you are a blogger, looking to publish great content on your blog, the Guest Crew is absolutely free for you. Most of the campaigns are paid, which mean, as a blogger you will get to publish guest posts on your blog.
Source: guestcrew.com