Available products from CEC-OS
A Level3 research product is available from CATDS/CEC Locean Expertise Center: L3 Debiased v7 (and previous version: L3 Debiased v5)
The differencies between this product and the operational OS products are explained in the the document 
OS L3 products : Differences and Pros-Cons.
A Level3 research product over Arctic from CATDS/CEC Locean Expertise Center is also available: L3 Arctic
A Level4 SMOS/SMAP OI research product is available from CATDS/CEC Lops Expertise Center: