> Seems to me a rather circular definition, because I'm not sure anyone except Microsoft has a 'productivity suite'?
LibreOffice and its descendents (e.g. Collabora) spring to mind immediately. There are a few. Apple has its own tools (Keynote, etc) but I don't think they're necessarily a suite.
There aren't going to be a lot of new productivity suites, due to how overwhelmingly dominant Microsoft is.
In fact, the key metric for any office site isn't its features or numerical prowess, but rather how well it can read and write Microsoft office files.
Seems to me a rather circular definition, because I'm not sure anyone except Microsoft has a 'productivity suite'?
Other than Google, but I wouldn't count gmail and a dozen cancelled chat platforms as an IRC/Slack competitor except in the very loosest sense.