http://www.geneinfinity.org/images/aminoacids.jpg
http://www.jalview.org/help/html/misc/properties.gif
http://www.geneinfinity.org/images/aapks.jpg
A.A. properties of standar amino acids and amino acids in proteins (mass, surface, volume, pKa, pI, solubility, density of amino acids, hydrophobicity, solvent accessibility, Ramachandran plots).
http://www.imb-jena.de/IMAGE_AA.html
Input a protein sequence and obtain plots that characterize its hydrophobic character, which may be useful in predicting membrane-spanning domains, potential antigenic sites and regions that are likely exposed on the protein's surface.
http://arbl.cvmbs.colostate.edu/molkit/hydropathy/index.html
http://swift.cmbi.kun.nl/swift/future/aainfo/
http://prowl.rockefeller.edu/aainfo/contents.htm
http://www.genome.jp/aaindex
http://www.chem.qmul.ac.uk/iupac/AminoAcid/