http://h34nug3iwqjf2376fmmzdhgqivckzemcujmarlptfqeqtq7vya47yyad.onion/page/17/index.html
It uses the BibTeX format to store bibliographic data and provides a nice KDE interface to search through your BibTeX files. Its main window looks like this: Managing your References Since you can sort your data by various criteria such as author, title, year or journal, you will usually find the article you are looking for instantly.