If you are not wanting a full windowing OS (just a windowing display) then https://en.wikipedia.org/wiki/Tmux may do the job for you in unix-a-like environments, with or without https://en.wikipedia.org/wiki/Byobu_(software). In fact I sometimes have several log monitoring windows open in one tmux screen, essentially a dashboard like this and you describe. Done this way all that is running is console applications: almost any existing console application can work well and there is no need for extra development to interface a new windowing API.
You could use an existing CUI/TUI library to write such a condole-based windowing system, if tmux/similar don't quite do what you are looking for. For example https://github.com/chjj/blessed if node.js is your bag. Similar libraries exist for other languages too (go, .net, ...) - search for "Terminal UI <language>" or "Console UI <language>" and options should pop up.