GEOmetadb is an attempt to make access to the metadata associated with the NCBI Gene Expression Omnibus (GEO) samples, platforms, and datasets much more feasible for common biologists and bioinformatians/statistians.
GEOquery effectively establishes a bridge between GEO and BioConductor. Easy access to GEO data from BioConductor will likely lead to new analyses of GEO data using novel and rigorous statistical and bioinformatic tools.
GEO2Enrichr is web application and two browser extensions (one for Chrome and another for Firefox) designed to facilitate the extraction of signatures from studies posted on the Gene Expression Omnibus (GEO) database.
MARQ (Microarray Rank Query) is an online microarray retrieval tool based on rank statistics. Datasets in MARQ, most of them retrieved from GEO, are processed into signatures, which are lists of genes ranked by their level of differential expression. Each dataset defines one of more of these signatures based on the possible comparisons of its constituent samples.