OpenDatabase
  1. ASM journal
  2. DOAJ
  3. Open Access Library
  4. OPEN J-GATE
  5. PLoS
  6. PubMed
  7. PubMed Central
  8. Socolar
  9. The national academic
  10. 奇迹文庫
  11. 漢斯出版社(Hans Publishers
  12. 臺大學術資源網
  13. Astrophscis data system(ADS)
  14. BMJ
  15. Centers for disease control and prevention(CDC)
  16. DOE Information bridge
  17. INTUTE: Science, Engineering and Technology
  18. Plantfact
  19. SCIRUS
  20. TechXtra
  21. The national science digital library(NSDL)
  22. UNESCO
  23. AgZines
  24. arXiv
  25. bepress powered working papers
  26. Bioline International
  27. BioMed Central
  28. BOAI
  29. Caltech Collection of Open Digital Archives (CODA)
  30. Caltech Library System
  31. CiteSeer
  32. CogPrints
  33. dspace
  34. EEVL's Ejournal Search Engine
  35. eScholarship
  36. FreeFullText.com
  37. FreeMedicalJournals.com
  38. Health InterNetwork
  39. HighWire Press
  40. J-satge
  41. NDLTD
  42. NII-REO
  43. Repec
  44. SciELO
  45. Science Online
  46. SPARC
  47. The Berkeley Electronic Press
  48. The on line books page
  49. University of California Press eScholarship editions
  50. USPTO patents
  51. 研究記要全文