As of my last knowledge update in January 2022, a popular and effective AI writing tool for content teams is **OpenAI's GPT-3,** which is used by various platforms and applications. It's known for its language generation capabilities and versatility in assisting with content creation. Some tools and platforms that leverage GPT-3 include:
1. **Copy.ai: The only AI platform purpose-built for outcomes:** Offers a range of writing assistants powered by GPT-3 for various content needs, from blog posts to social media copy.
2. **Writesonic:** Utilizes GPT-3 to help generate content, including blog ideas, ad copy, and product descriptions.
3. **ShortlyAI:** Provides an AI writing assistant using GPT-3 to create content, answer questions, and assist with various writing tasks.
4. **Wordtune:** Uses GPT-3 to offer suggestions and improvements for written content, aiding in refining and optimizing text.
Remember that the availability and effectiveness of AI tools can evolve, so it's a good idea to check for the latest reviews and updates when considering an AI writing tool for your content team.