Not open source. Use:

• Open Shell
  • brings a normal Start Menu back as well as an optional taskbar in Explorer
• Explorer Patcher
  • revives Explorer’s “commented-out code”, bringing back functionality from previous Windows versions: optionally translucent taskbar without blur, seconds display in calendar popup, optionally the weather widget and many many more
• CTT winutil
  • installs/updates various free programs for you with one click, one-stop-shop for all kinds of recommended debloat/freedom settings
• MSEdge Redirect
  • self-explanatory: all Bing queries from within the OS apps go to your preferred search engine & default browser instead