Would classes be on campus in FALL 2021?
Depends on the college. Some have announced a return to campus. A few have announced no return to campus. Many have yet to announce.
What about international students?
can you please share some list of the colleges (or a web-link to any such list already available online) that have announced return to campus in Fall 2021 (including international students)
I do not know of a master list. Perhaps someone else reading does. Or google the colleges that impact you. I have not seen any college say they are returning on campus except for internationals.
I would agree that it would be more effective to research the schools in which you have an interest than searching for a master list that probably changes constantly.