Merlot
Access 
Merlot is a collaborative effort to creating and sharing materials, comments and reviews on a discipline basis.
Fee Policy 
The information within MERLOT is public and open to anyone. The links to the learning materials are in MERLOT to help users find these web sites
Free Retrieved Material
Users have access to a considerable amount of rich-in-content info for free. Access to complete sources does however depends on each website's policy
Linking Richness
Electronic resources are pertinently selected and linked with the added value of a rating system