Looking for an Extension? Have an Extension request? Post your request here for help. (Note: This forum is community supported; while there is an Extensions Development Team, said team does not dedicate itself to handling requests in this forum)
I suppose that since nobody answered and assuming that you searched, the conclusion is probably that no such extension is available.
Nothing wrong with an extension request but would need to be more specific about the criteria.
e.g. locked topics probably shouldn't be bumped, and what about announcements and global announcements, or topics in certain forums?
Spelling is freeware, which means you can use it for free.
On the other hand, it is not open source, which means you cannot change it or publish it in a modified form.
Time flies like an arrow, but fruit flies like a banana.