These services gives you free traffic for your websites. Most of them are working in a "Hits per Click" method. You have to browse the websites on their network or click on links and you get free hits that translate into free traffic to your site.
WhereGoes redirection tracking
This is a great online tool that shows you all the locations that a URL is redirecting through. Really useful if you are using adservers or any other redirections. WhereGoes
Free images for your website
Occasionally you'll need some imgaes for your website. It can be something random like a girl holding a phone or something specific for you current article.