Cloud infrastructure related services
Access to Amazon cloud services is free for 1st year for new users. This offer is available at http://aws.amazon.com/free. Use your amazon.com login if you have one already.
Business productivity and collaboration software as a service
Sign up for Zoho apps for your domain at https://workplace.zoho.com/orgsignup.do?plan=free
Hosted Config Management Tools
Set up a free chef server account with Chef.io using this link https://manage.chef.io/signup