Zoho and Collabora spring immediately to mind.

Unironically Proton. Seems like they are slowly building their own suite of office tools.

Canva is a go to over Microsoft and Adobe for a huge crowd of people

Collabora Online

For which feature?

How people in companies really need the features of Word, Excel and PowerPoint?

I often see people using space to right align a date, the pros use tabs.

Open source... But yeah.. ms won this game