Tools--plagiarism checker and duplicate content finder
国际公认的查重软件是Turnitin和iThenticate，Turnitin的优点是便宜，但大多数SCI期刊使用的是iThenticate，两者的查重效果大约相差1%-3%，很多杂志社的状态中会有manuscript send to CrossCheck的意思就是送去iThenticate查重，如果查重不过的话通常会退回重改，但是若不是重复率高的离谱一般不会因此而拒稿。
iThenticate: 收费，但是可以发给所里的图书馆免费查重。
Turnitin: 收费。
Free online plagiarism checker for teachers and students. Copyscape and Turnitin alternative.
如果查重率过于高，可使用Plagiarisma的Article Rewriter功能，可以自动进行同义词替换，并将可选的同义词显示出来，供作者选择
Plagiarism Checker by Grammarly （收费）
Copyscape is a free plagiarism checker. The software lets you detect duplicate content and check if your articles are original.
Professional plagiarism checker that reviews over 14 trillion web pages, articles, books, and periodicals to help you detect possible plagiarism in your papers. It finds not only copy paste plagiarism, but paraphrasing, good and bad citations. Plagramme.com has a lot of unique functionalities - it is multilingual, able to detect good and bad citations, uses several scoring methods to score papers. It is uniquely capable of detecting paraphrasings. User is able to edit his paper online with a built-in tools. The main thing, that it has ways to get your paper checked free.
Dupli checker 据说很瞎
