All COSMOS data can be found in the public/private COSMOS Archive. Direct links to particular data sets are also given to the right of each data set description on this website.
This archive is maintained by IRSA at IPAC. All COSMOS data (images and catalogs) that has been publicly released are available through this interface. This includes a cutout server and catalog search tool as well as a repository of images, spectra, and catalogs.
Private COSMOS Archive (team only)
Also maintained by IRSA, this archive includes all data obtained by the project that is available to the team. This site is password-protected. Data moves from this archive to the public archive according to a data policy, usually one year after the data was obtained. This includes a cutout server and catalog search tool as well as a repository of images, spectra, and catalogs.
A group of our European team members have developed a new data portal based on a convenient database query system.
Other data access tools
For an excellent web-based viewer of the COSMOS field, try Knud Jahnke's COSMOS Skywalker.
The HST data sets (ACS, WFPC2, WFC3, and NICMOS) can be obtained from this archive in their raw and on-the-fly reduced form. These data have no proprietary period and can be downloaded as soon as they have been processed from the telescope. In addition, MAST is providing an archive of COSMOS High-Level Science Products from HST and GALEX. These are the same processed data products available from the COSMOS archive at IRSA, but organized a bit differently.