It really is a suite that can combat Google's suite — and you can truly own it. Other than that, DDG for search, and your own domain for email (so that you could transfer it between different hostings if necessary).
I do have a Google account, but I use it for precisely two purposes: Google Play (my phone wouldn't work without one) and YouTube subscriptions (I can use an RSS reader for this, but it's a bit inconvenient). You can create a Google account without creating a Gmail account.