If you're talking about core infrastructure (operating systems, servers, etc.) used by serious businesses then the answer is pretty much all of them are much slower-paced. Look at how often Microsoft releases a service pack or new version of Windows, or Debian changes stable, or Postgres bumps the minor version. These things happen every year or two, not every month or two. Even Android, to the extent that it has any meaningful version numbering or naming at all, only tends to push out a major release or two per year, and in practice people's mobile devices don't get updated that often by their networks and many phones never get a major update within their normal lifetime.

Of course many developers issue point releases with security patches and important bug fixes more frequently, but changing functionality every few weeks in infrastructure software just seems crazy to me. It doesn't work well in Firefox-the-browser, so why would we expect it to work any better in Firefox-the-operating-system?