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dired-auto-readme
An Emacs package to automatically display a README file when one is present in a dired buffer.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Simplest and narutal is to display three different windows; hide scrollbars and you will be left with very thin line (1 pixel wide) between windows. Alternatively you can do some tricks to work around the issue similar as to what org-mode does, or something similar as to what I do in dired-auto-readme. I don't suggest since you will be fighting Emacs, and there are many issues and problems with what org or my package do. There is a reason why org uses src_blocks, and while org is great and do awesome job at what it does, there are still issues that are not easily overcome when you scratch under the surface (for example font-lock is in certain cases spooking, you don't have major/minor mode maps in src blocks, eldoc is not working properly etc.
Otherwise if you really want to do what you are writing look at polymode, perhaps you can do something similar to what you ask, but I am not sure for the vertical split.