> 750 hours per month of Linux, RHEL, or SLES t2.micro instance usage.
(along with S3 and some other services) I think it's only free for a year though.
Other than that, they have lumberyard[1] which is a game engine, but I think there are some weird terms like you need to use AWS if you use a server[2][3].
[0] https://aws.amazon.com/free/
[1] https://aws.amazon.com/lumberyard/
[2] https://aws.amazon.com/service-terms/#57._Amazon_Lumberyard_...
[3] > 57.4 Operating Restrictions. Without our prior written consent, (a) the Lumberyard Materials (including any permitted modifications and derivatives) may only be run on computer equipment owned and operated by you or your End Users, or on AWS Services, and may not be run on any Alternate Web Service and (b) your Lumberyard Project may not read data from or write data to any Alternate Web Service. “Alternate Web Service” means any non-AWS web service that is similar to or can act as a replacement for the services listed at docs.aws.amazon.com/console/lumberyard/userguide/alternate-web-services .