1. Mendeley

2. Easybib.com

3. EndNote

4. ReadCube Papers

5. Zotero

6. RefWorks

7. Cite This For Me

8. Sciwheel

9. cite4me.org

10. Citationsy

11. JabRef

12. Sorc’d

13. Citavi

14. Paperpile

15. F1000Workspace

16. Bibsonomy

17. refbase

18. BibDesk

19. Wkindx

20. Mybib