Apache Karaf might be a bit more popular than Azure App Service. We know about 1 link to it since March 2021 and only 1 link to Azure App Service. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Azure App Service (can be a Linux based on Windows Based). You will declare here what type of machine strength you need (cpu, memory, disk) - Note that you do not have access to the machines themselves , this is not a VM. You do have access of course to the folders where the application will be stored. https://azure.microsoft.com/en-in/products/app-service. Source: over 1 year ago
Apache Karaf with OSGi works pretty nice using annotation based dependency injection with the declarative services, removing the need to mess with those hopefully archaic XML blueprints. Too bad it's not as trendy as spring and the developers so many of the tutorials can be a bit dated and hard to find. Karaf also supports many other frameworks and programming models as well and there's even Red Hat supported... Source: about 3 years ago
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Docker - Docker is an open platform that enables developers and system administrators to create distributed applications.
AWS Lambda - Automatic, event-driven compute service
Apache ServiceMix - Apache ServiceMix is an open source ESB that combines the functionality of a Service Oriented Architecture and the modularity.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Now Platform - Get native platform intelligence, so you can predict, prioritize, and proactively manage the work that matters most with the NOW Platform from ServiceNow.