What AI-based tools or platforms do you use to speed-up creation of articles, content, copywriting?

There are many tools that leverage Artificial Intelligence algorithms and machine learning to generate content. I would say that it's a powerful way to increase the volume of articles and content that we can generate and publish per week (or per day..). How valuable do you find this approach and to what extent does it improve the speed and the volume of content you publish, considering the quality as well? And finally, what are the best options on the market you have experience with (e.g. hyperwrite, frase.io, froala, anyword, etc.)?