Quadparser: a program for finding putative G-quadruplex motifs

   G4P Calculator, an online program for predicting G-quadruplexes

   QGRS Mapper: a web-based server for predicting G-quadruplexes

   Quadfinder: a web-based server for identifying quadruplex-forming motifs

   GRSDB: a database of quadruplex forming G-rich sequences in alternatively processed mammalian pre-mRNA sequences

   Quadruplex.org: a website to serve the quadruplex community

   Quadbase: a database of quadruplex motifs

   Quadbase: downloadable data on predicted G-quadruplexes

   G-quadruplex in Wikipedia, a good introduction to G-quadruplexes

   nBMST: non-B DNA Motif Search Tool