I create a lot of content, of many different types, every day. So I tend to jump on any tool which might make creation easier. Your mileage will vary. I test and discard lots of tools, but that’s OK. Creating content consistently is a real challenge, so any tool which helps with that is a worthwhile investment.
Currently, my favorite tools include…
Scrivener. Invaluable. Don’t know where I’d be without it.
Ember. (Mac) A recent acquisition. For research, as well as to check what assets have been created, and need to be created for a project.