Zotero vs Refworks for reference managing

 https://www.zotero.org/

 Zotero works like Refworks. It also has a WORD add-on. 

So far, to me, its biggest plus is its Chrome extension, which enables me to import a useful webpage into 'my library'. 

In 'my library', I can build Collections, and Sub-collections. Each collection can be exported as an RTF file.