That litestep desktop is still using rainmeter. litestep is a replacement shell, it changes the taskbar and adds/removes rules as far as window borders, shadows, controls, keyboard shortcuts, etc.

There are dozens of replacement shells out there for windows. Eku and I(when I'm on windows) use bblean, a port of the blackbox window manager to Windows. Its easy to configure, but only if you read the documentation. Docs are important if you want to customize.

Rainmeter prints info on the screen based on config files. The documentation explains how to write those config files.