Apx is the default package manager in Vanilla OS. It is a wrapper around multiple package managers to install packages and run commands inside a managed container.
DevPod Alternatives
DevPod is described as 'Is infrastructure-independent and client-only, which makes it incredibly easy to get started with. Codespaces but open-source, client-only and unopinionated. Works with any infra, any programming language, any IDE, etc' and is a IDE in the development category. There are more than 25 alternatives to DevPod for a variety of platforms, including Mac, Linux, Windows, Web-based and BSD apps. The best DevPod alternative is Visual Studio Code, which is free. Other great apps like DevPod are VSCodium, Vim, Eclipse and IntelliJ IDEA.