I've already posted about using the free Oberlo Business Name Generator to come up with the names of fictional businesses in your screenplay or novel, and for coming up with titles for a non-fiction book or newsletter. It's also a useful brainstorming tool if you write for kids.
For instance, I was thinking about writing a story in which a young child explores a pond and encounters magical versions of all the type of creatures that hang around ponds. I wanted to come up with fun personalities or identities for each creature. To start, I typed "frog" into the Generator. Here are some of the combinations it came up with:
Frog Chef
Daydream Frog
Sidekick Frog
TopDog Frog
Singular Frog
General Frog
Thunder Frog
Hip Frog
Everlasting Frog
Frog Doctor
Covert Frog
If those don't give you some ideas for the kind of frog the child could encounter, you're not a writer! And I'll bet you can think of other ways that the Generator can fit into your brainstorming as well.