HALis an open archive where authors can deposit scholarly documents from all academic fields. It has a good position in the international web repository ranking

• Paid Open Access: yes
• Pre/post-print archiving: yes, pre-print and post-print
• Embargo period: n/a
• Other restrictions/curiosities:  Creative Commons Attribution Licence, must link to DOI

The Healthcare Cost and Utilization Project (HCUP) is a family of healthcare databases and related software tools and products developed through a Federal-State-Industry partnership and sponsored by the Agency for Healthcare Research and Quality (AHRQ). Among the open software they make available, we can highlight:

- Clinical Classification System (CCS) for ICD-9-CM and ICD-10-CM.

- Chronic Condition Indicator (CCI).

- Elixhauser Comorbidity Software.

This open software tools can be used for the management of clinical-administrative databases with research purposes.