esterOS is an "operating system" developed by shanestech. He constantly promotes it on his tiktok but it's just KDE with a theme, cloning the look of macOS and having no style of its own. It also has a version for Android, which is nothing more than AOSP with a custom Launcher and the odd improvement.

Also, shanestech is very toxic to his community, he has doxxed many people (including face and IP address). Treat everyone badly.