The question's title is straightforward ... can you recommend any decent tool for annotating named entities in a collection of domain-specific textual materials, for instance, medical research papers. I need to have a large training dataset in order to train my Maximum Entropy Sequence Model. However all the tools I checked online are either inaccurate or very difficult to use.
P.S/ the final output classifiers are domain specific, hence, the medical field is only an example, any recommendations of tools in different domain are most appreciated.
Thank you.