One thing which I have never looked more closely at, but which I think is very interesting, are “Serverless Functions”, although they are not so serverless because they run on a server. Whatever. On Hacker News, I found a GitHub repository and an article about it.
With fassd, it’s easy (and possible without Kubernetes) to install a runtime for serverless functions on a single server. Sort of like Lambda from Amazon, but open source and self-hosted.