The Modern Application Stack - Part 6: Browsers Aren't the Only UI – Mobile Apps, Amazon Alexa, Cloud Services explores alternative ways to build client applications by combining existing cloud services with new logic. The post covers technologies such as IFTTT, Workflow, Amazon Alexa, and AWS Lambda, which can be used to automate tasks, create complex workflows, and implement voice-controlled skills. It also introduces MongoDB Stitch, a backend as a service that provides a REST-like API to MongoDB and allows for fine-grained data access controls. The post aims to go wide rather than deep, touching on many technologies and providing examples of how they can be used to build applications quickly and efficiently.