Apps similar to Winstep Xtreme include Object Desktop. It's paid, but gDesklets is free. Other options are SAO Utils. In total there are three System Tweakers like Winstep Xtreme for Windows and Linux.
Transform your Windows desktop with this comprehensive suite offering interface customization, performance boosts, and desktop tools like Fences, Start10, and DeskScapes. Developed by Stardock, it delivers visual and functional upgrades while maximizing OS capabilities.
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gDesklets is an architecture for "desklets", which are tiny applets sitting on your desktop in a symbiotic relationship of eye candy and usefulness.
SAO Utils provides you a customizable Full-Dive 3D app launcher with varieties of themes, desktop widgets and powerful utilities. In built-in stereo mode, you can even browse multiple web pages in the same time inside the cool launcher virtual space with stereo displays.
