Jasper: Similar to Writesonic, Jasper is one the first AI content tools. It's a good option to try if you are mainly interested on creating written content. Price starts at $52/month.
Chat OpenAI (ChatGPT): This is the tool that accelerated the AI revolution. It's not only great for writing, but can also create responses to every knowledge that exists on the web. It's currently on a beta stage and free of charge.
RationalePowered by GPT-AI: Rationale gives you pros and cons of any decision in just 5 seconds.
Perplexity: Perplexity is a search engine that gives you the right answer to anything, with sources and related topics.