There are a lot of tools for this, I searched "nlp text annotation tool", and found this thread: https://www.quora.com/What-are-the-best-tools-for-manually-anno

There are a lot of tools for this, I searched "nlp text annotation tool", and found this thread: https://www.quora.com/What-are-the-best-tools-for-manually-annotating-a-text-corpus-with-entities-and-relationships https://www.quora.com/What-are-the-best-tools-for-manually-a... There's no clear "best" as far as I can see, so depends what you're looking for.