[Squarex]

I have not tried LibreOffice Online in many years, but it does not look like LibreOffice at all. It has the MSOffice ribbon clone. It is closer to OnlyOffice

[amazari]

It is LibreOffice at its heart, but wrapped with a web-techs UI, AFAIK.

[Kwpolska]

LibreOffice has had a ribbon for a while.

[Squarex]

I know, but it was not this direct ms office clone.