[alekratz]

I'll second LibreOffice. It's much more polished than OpenOffice, and it's quite functional and mature. It has definitely gotten the TLC that OpenOffice so desperately needed about 10 years ago. I'm not sure if it has the infinite canvas that the OP is looking for, but it's definitely nothing to sneeze at.

[jacmoe]

It's more polished because the (almost) entire team of OpenOffice left and created the LibreOffice project, AFAIK.

Same as what happened with MySQL -> MariaDB.