See Wikipedia's Comparison of Reference Management Software for an exhaustive list of software.
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Strengths |
Social Networking;PDF Annotation |
Free; RSS feed reader;Direct database exports |
Open source; Firefox extension; user forum |
Sign in/Link with Facebook? |
Yes |
No |
No |
Cost |
Basic service free; more features & storage for a fee |
Free for Texas State University students, staff, faculty. |
Basic service free; more features & storage for a fee |
Formats/Access Points |
web, desktop, mobile apps |
web, mobile site |
web, desktop, mobile apps, Firefox extension |
Mobile |
iPhone app, unofficial Android app |
RefMobile website for mobile devices |
iPhone and Android apps |
MS Word Integration |
Yes |
Yes |
Yes |
PDF Annotation |
Yes |
No |
Not Quite. |
Full Text PDF search |
Yes |
No |
Yes |
Bookmarklets/Importing from Databases |
Yes |
Yes |
Yes |
Tagging |
Yes | No | Yes |
Social Networking |
Yes |
No |
Yes |
Groups & Collaboration |
Free accounts allowed 1 private group and public groups | RefShare allows users to share citations with others |
Free accounts allowed private groups and public groups |
Store PDFs in Personal “Library” |
Yes |
Yes (Limited) |
Yes |
Storage |
1 GB free web space |
Unlimited |
100 MB free web space |
RSS Feeds |
No |
Yes; Feed Reader & RefShare Feed capabilities |
Yes |
Open source or Proprietary? |
Proprietary; Elsevier | Proprietary; ProQuest |
Open Source |