To help users of remote sensing data, the NASA Goddard Earth Sciences Distributed Active Archive Center (GES DAAC) has developed a series of desktop and on-line tools. These are presented in this article. Various HDF readers for AIRS and MODIS data have been written in IDL, C and Fortran. HDFLook for AIRS and MODIS works as a desktop application as well as an integral part of various subsetting systems. AIRS QuickLook is an on-line package that allows users to view AIRS/HSB/AMSU Level-1B data online by specifying a channel prior to obtaining data. AIRS Online Channel/Variable subsetter provides on-line subsetting of the AIRS Level 1B and Level 2 data products. OASIS (Online data AnalySIS) is an IDL-based HTML/CGI interface for search, selection, and simple analysis of earth science data. TRMM Online Visualization and Analysis System is designed for quick exploration, analyses, and visualization of TRMM Level-3 and other precipitation products. WebGIS is online web software that implements the Open GIS Consortium (OGC) standards for requesting rendered maps from OGC-compliant servers.