Protein Protein Interaction
AfCS	http://www.afcs.org/
BIANA	http://sbi.imim.es/web/BIANA.php
BioGRID	http://thebiogrid.org/
BioPAX Wiki	http://biopaxwiki.org/cgi-bin/moin.cgi/Biological_software_supporting_BioPAX
Cell Signaling Technology	http://www.cellsignal.com/
CellDesigner	http://www.systems-biology.org/cd/
CellML	http://www.cellml.org/models
Common Gene Properties	http://cgap.nci.nih.gov/Genes/CommonView
Cytoscape	http://www.cytoscape.org/
DIP	http://dip.doe-mbi.ucla.edu/
DOQCS	http://doqcs.ncbs.res.in/
EndoNet	http://endonet.bioinf.med.uni-goettingen.de/
graphweb	http://biit.cs.ut.ee/graphweb/
himap	http://www.himap.org/main/index.jsp
HPID	http://wilab.inha.ac.kr/hpid/
HPRD	http://www.hprd.org/
Human Interactomics	http://interactome.org/
IntAct	http://www.ebi.ac.uk/intact/site/index.jsf
IntAct	http://www.ebi.ac.uk/intact/
interdom	http://interdom.lit.org.sg/
InterViewer	http://interviewer.inha.ac.kr/
KEGG BRITE	http://www.genome.jp/kegg/brite.html
MAGNet	http://magnet.c2b2.columbia.edu/
mcponline	http://www.mcponline.org/cgi/content/full/1/2/104/T1
metacore	http://www.genego.com/
MIM NCI	http://discover.nci.nih.gov/mim/
mint	http://mint.bio.uniroma2.it/mint/Welcome.do
MNAligner	http://intelligent.eic.osaka-sandai.ac.jp/chenen/MNAligner.htm
netalign	http://bioinformatics.oxfordjournals.org/cgi/content/full/22/17/2175
NetPath	http://www.netpath.org/pathways?path_id=NetPath_9
Network Ontology Analysis	http://www.aporc.org/noa/
ONCOMINE	https://www.oncomine.org/resource/login.html
ophid	http://ophid.utoronto.ca/ophid/
PANDIT	http://www.ebi.ac.uk/goldman-srv/pandit/pandit.cgi?action=browse
Pathguide The Pathway Resource List	http://www.pathguide.org/
PATIKA Project Web site	http://www.patika.org/
PATIKAweb Product Site	http://www.cs.bilkent.edu.tr/~patikaweb/
pdzbase	http://icb.med.cornell.edu/services/pdz/start
piana	http://sbi.imim.es/piana/
PINA	http://csbi.ltdk.helsinki.fi/pina/
pips Human Protein	http://www.compbio.dundee.ac.uk/www-pips/index.jsp
poogle	http://mips.gsf.de/proj/ppi/poogle.html
PPI	http://mips.gsf.de/proj/ppi/
PPID	http://www.anc.ed.ac.uk/mscs/PPID/
protein interaction	http://salilab.org/pibase
Reactome	http://www.reactome.org/
string	http://string.embl.de/
suiseki	http://www.pdg.cnb.uam.es/suiseki/
swoop	http://code.google.com/p/swoop/
The MathWorks	http://www.mathworks.com/products/simbiology/
virgo	http://whipple.cs.vt.edu:8080/virgo/
VisANT	http://visant.bu.edu/
WIKI PI	https://hagrid.dbmi.pitt.edu/wiki-pi/