O-GLYCBASE The database is non-redundant in the sense that it contains no identical sequences, unless there is conflicting glycosylation data. http:// www.cbs.dtu.dk/databases/OGLYCBASE/
Oligo Pre-Designed Oligonucleotide Database http://www.ctaalliance.org/MCBI/OligoDatabase.html
Oligonucleotide Database http://www.oligo.net/oligo_screens.htm
Encephalitozoon cuniculi Oligonucleotide Database http://fc.isima.fr/~rimour/oligo/
VirOligo (Virus Oligonucleotide) http://viroligo.okstate.edu/
Maize Oligonucleotide Array Project http://www.maizearray.org/maize_search_basic.shtml
Rice Oligonucleotide Array Project http://www.ricearray.org/rice_search_basic.shtml
DOLGANOV LAB - Oligo Database http://www.airwaydiseasegenomics.org/
i-Genome: A database to summarize oligonucleotide data in genomes http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=526275
AOBase-Antisense oligonucleotide selection and design http://www.bioit.org.cn/ao/aobase
OMIM Online Mendelian Inheritance in Man (OMIM) http://www.ncbi.nlm.nih.gov/omim/
Online Online transaction processing (OLTP) database system http://dssresources.com/glossary/239.php
Ontology Gene Ontology Database http://www.geneontology.org/
Operon DataBase http://odb.kuicr.kyoto-u.ac.jp/
Uber-Operon Database http://csbl.bmb.uga.edu/uber/index.php
ORF (Open Reading Frame) Virus Database WebORF http://www.biochem.ucl.ac.uk/bsm/virus_database/weborf.html
AlterORF - Database of alternate open reading frames http://www.cienciavida.cl/alterorf/
Organelles Complete organelle genome database http://megasun.bch.umontreal.ca/ogmp/projects/other/all_list.html
The Plant Organelles Database is a specialized database project dedicated for plant organelle research. http://podb.nibb.ac.jp/Organellome/
A database of organelle proteins, and subcellular structures / complexes http://organelledb.lsi.umich.edu/
GOBASE: the organelle genome database http://megasun.bch.umontreal.ca/gobase/
Organelle map database http://proteome.biochem.mpg.de/ormd/
Database http://www.nal.usda.gov/pgdic/Probe/v6n1/organ.html
Functional Genomics of Organellar Introns Database (FUGOID) http://web.austin.utexas.edu/fugoid/introndata/main.htm
Organic CSD (Cambridge Structural Database): Crystal structure information for organic and metal organic compounds. http://www.ccdc.cam.ac.uk/prods/csd/csd.html
Organism GMOD is the Generic Model Organism Database http://www.gmod.org/
Merine Database http://www.mbl.edu/marine_org/marine_org.php?func=browse&myID=D1
Organism Database http://saf.bio.caltech.edu/model_org.html
Origin OriDB - DNA Replication Origin Database http://www.oridb.org/
Ortholog InParanoid: Eukaryotic Ortholog Groups http://inparanoid.sbc.su.se/
TreeFam (Tree families database) is a database of phylogenetic trees of animal genes. http://www.treefam.org/
ORTHOLOG http://zfin.org/zf_info/dbase/PAPERS/ZFIN_DataModel/sectionii_6.html
EGO - Eukaryotic Gene Orthologs:Orthologous DNA sequences in the TIGR gene indices http://compbio.dfci.harvard.edu/tgi/ego/
Roundup is a large-scale database of orthology covering over 220 publicly available genomes. https://rodeo.med.harvard.edu/tools/roundup/
Non-supervised Orthologous Groups :eggNOG

http://eggnog.embl.de/
Experimentally verified orthologous transcription factor binding sites http://genome.imim.es/datasets/abs2005/
COG - Clusters of Orthologous Groups of proteins Protein families from complete microbial genomes http://www.ncbi.nlm.nih.gov/COG
DoOP - Databases of Orthologous Promoters http://doop.abc.hu/