  In this paper, we describe ALTER, an auxiliary text rewriting tool that
facilitates the rewriting process for natural language generation tasks, such
as paraphrasing, text simplification, fairness-aware text rewriting, and text
style transfer. Our tool is characterized by two features, i) recording of
word-level revision histories and ii) flexible auxiliary edit support and
feedback to annotators. The text rewriting assist and traceable rewriting
history are potentially beneficial to the future research of natural language
generation.
