What are some alternatives?
When comparing Rackspace and DigitalOcean, you can also consider the following products
AWS - Amazon Web Services offers reliable, scalable, and inexpensive cloud computing services. Free to join, pay only for what you use.
Linode - Deploy and Manage Linux Virtual Servers in the Linode Cloud. Get a server running in minutes with your choice of Linux distro, resources, and node location.
000webhost - Zero cost website hosting with PHP, MySQL, Cpanel & no ads!
Microsoft Azure - Windows Azure and SQL Azure enable you to build, host and scale applications in Microsoft datacenters.
HelioHost - Community powered free hosting for everyone.
Vultr - VULTR Global Cloud Hosting - Brilliantly Fast SSD VPS Cloud Servers. 100% KVM Virtualization