New Resources for Writing/Public Speaking in Chinese/Mandarin?

I occasionally have to write short pieces in Mandarin or give short speeches. I have found technology aids for parts of it (google translate, using Wikipedia to find technical terms, etc.). I am curious what the more up-to-date folk are using for this type of thing. I am especially interested in:
-Programs or apps that will “read” text or add pinyin.
-Programs that help with grammar.
-Popular AI materials.

I asked chat GPT some questions in Mandarin and it produced pretty serviceable text that was more accurate summaries than what I would have come up with on my own. Grateful for any tips, hacks, or advice.