Google recently stepped up it's game against AWS in the free space, which offer similar but more limited free use of it's environment. The free tier, which offers enough power to run a small app in Google’s cloud, is offered in addition to the free credits provided to be used within 12 months. This tier now allows for free usage of a small (f1-micro) instance in Compute Engine, Cloud Pub/Sub, Google Cloud Storage and Cloud Functions. While AWS also has a free tier, the virtual machine isn't offered within the AWS free tier. Google's free tier now includes 15 services.
The addition of the Compute Engine instance and 5GB of free Cloud Storage usage is probably the most important update here because those are at the core of most cloud applications.