Some links I found for SNOMED:

http://www.health.govt.nz/nz-health-statistics/classification-and-terminology/new-zealand-snomed-ctr-national-release-centre

SNOMED Information link: http://www.nlm.nih.gov/research/umls/Snomed/snomed_main.html

Includes Browser app download link. 

SNOMED online browser: http://vtsl.vetmed.vt.edu/

Its part of a Veterinary school website, but it was always useful to me for a quick lookup of a SNOMED concept. It seems more or less complete.

 LOINC: http://loinc.org/

Downloads link to RELMA search engine app : http://loinc.org/downloads

 The AU online Health DB/Data Dictionary: http://meteor.aihw.gov.au/content/index.phtml/itemId/431171

You may need a login to get full access.

This is an example of an online data dictionary ; but note that the concepts are strictly Australian.