up­tex – Uni­code ver­sion of pTeX

upTeX is an ex­ten­sion of pTeX, us­ing UTF-8 in­put and pro­duc­ing UTF-8 out­put. It was orig­i­nally de­signed to im­prove sup­port for Ja­panese, but is also use­ful for doc­u­ments in Chi­nese and Korean.
It can pro­cess Chi­nese sim­pli­fied, Chi­nese tra­di­tional, Ja­panese, and Korean si­mul­ta­ne­ously, and can also pro­cess orig­i­nal LaTeX with \in­pu­tenc{utf8} and Ba­bel (Latin/Cyril­lic/Greek etc.) by switch­ing its \kcat­code ta­bles.