This is brill for assessing your writing for clarity and simplicity. It highlights adverbs, passive voice, and complicated words and sentences.
The Cliché Finder highlights ‘that old chestnut’ in your writing so you can avoid overused expressions.
Thesauruses are essential tools for every writer.
I could play with this name generator all day. There’s a myriad of fun name and description generators.
This website, and the author’s six thesaurus books, has helped me enormously in the past and currently.