Since the past few months, I have been closely watching the serverless execution trends in the industry. I find the whole concept of writing serverless code on the cloud extremely exciting and a great paradigm shift.
Especially for mobile and IoT apps, I think the below serverless execution environments hold great promise. Developers don't have to worry about provisioning servers and horizontal scaling of their apps - everything is seamlessly handled by the cloud. And you only pay when your code is invoked !
- IBM OpenWhisk - http://www.ibm.com/cloud-computing/bluemix/openwhisk/
- Azure Functions - https://azure.microsoft.com/en-in/services/functions/
- Google Cloud Functions - https://cloud.google.com/functions/docs/
- AWS Lambda - https://aws.amazon.com/lambda/
It is also interesting to note that IBM has made the OpenWhisk platform open source under the Apache 2 license. The entire source code is available here - https://github.com/openwhisk/openwhisk
A good article explaining the underlying components of OpenWhisk is available here.