Mendeley is just one alternative to RefWorks. This table compares the most popular personal citation managers.
| Feature | Mendeley | RefWorks | Zotero | Endnote |
| Cost | Free for 2GIG | $100 | Free for 300MB | $249.95 |
| URL | http://www.mendeley.com/ | http://www.refworks.com/ | http://www.zotero.org/ | http://endnote.com/ |
| Operating system | Windows / Mac / Linux | Windows / Mac / Linux | Windows / Mac / Linux | Windows / Mac |
| Mobile compatility | Official iOS app; unofficial Android app | Mobile site | Unofficial iOS and Android apps | Official iOS app |
| Citation styles | Various | Various | Various | Various |
| Word processor integration | MS Word, Open Office | MS Word | MS Word, Open Office, Pages, Google Docs | MS Word, Open Office, Pages |
See here: http://en.wikipedia.org/wiki/Comparison_of_reference_management_software for more options.