Other sites

Sentinel 2 sites :

ESA: Sentinel-2 and other ESA missions of the Copernicus Programme
ESA (satellite): Sentinel-2 on the ESA website
Satellites: Sentinel-2  and Copernicus on the Earth Observation Portal
Learn about Sentinel-2's production: user's guide (ESA document)

Sites instrument MSI :

Général : MSI Presentation
ESA : MSI frequences and techniques
ESA : Everything about MSI

Sites d’accès aux données :

PEPS
Theia