Big Sur | windows://themed

SecureUxTheme – https://github.com/namazso/SecureUxTheme

Cursors – https://github.com/antiden/macOS-Sierra-cursors-for-Windows

Icons pack – https://www.deviantart.com/niivu/art/macpac-Icon-Theme-801554621
Icons software : 7TSP – https://www.deviantart.com/devillnside/art/7TSP-GUI-2019-Edition-804769422

Big Sur pack : https://www.deviantart.com/niivu/art/Big-Sur-Windows-10-Suite-849525656

Rainmeter – https://www.rainmeter.net/
Rainmeter skins – https://www.deviantart.com/fediafedia/art/Big-Sur-BETA-2-for-Rainmeter-846882462

Dock software : Nexus dock – https://www.winstep.net/nexus.asp

OldNewExplorer – http://m.majorgeeks.com/files/details/oldnewexplorer.html

StartIsBack – https://startisback.com/#download-tab

For everything else please use web search engine.