Hi,
I've found this thread http://forum.enjoysudoku.com/favorite-sudoku-sites-t4196.html but it's a little outdated.
Here is my list of sites:
http://www.enjoysudoku.com/webplay/
https://www.nytimes.com/puzzles/sudoku/
http://classicpuzzlegames.com/sudoku/
https://www.sudokupeople.com/
https://sudokukingdom.com/
If you know other good websites please share.
ty