I am looking for a sophisticated plagiarism software to cross-check the students' drafts before sending to a journal. Any well proved and popular software?
Alas, students are more sophisticated than software, especially when they know what software you are using. A good Google of peculiar, unattributed phrases in their drafts is a good precaution. However, it will not find material plagiarised from the dusty stacks in the library or from foreign sources.