I know Mendeley and I'm used to work with it and its LibreOffice plugin, but do you know/use any other reference manager in your job to prepare research articles?
I'm using Zotero which is a free-access software. It is highly easy to use it (you can master it within 2 hours) and the plug-ins that you can add are just amazing (Like extracting the notes from your pdf files, retrieving the metadata from them) also the add-on to Microsoft Word make it so easy to add references and to generate your bibliography.
Look also at JabRef 4.0. It is an open source, graphical application for managing bibliographical databases. JabRef is designed specifically for BibTeX format, but can import and export many other bibliographic formats.
Here you have nice comparision of reference management software:
Literature management programmes are offered today and can be useful, but their value for the quality of substantial research is overestimated in many cases.