ExPASy-ProtParam: Computes parameters for a given protein, including molecular weight, pI, extinction coefficient, etc.

Oligo Calc: Calucate the melting temperature and other properties of oligos such as primers.

BLAST: Search for sequence homology using DNA or protein sequence.

Fluorescence SpectraViewer: Find the excitation and emission wavelengths of different fluorophores.

Phosphate Buffer Calculator: Calculates ratio of monosodium and disodium phosphate for buffer of a target pH.

PubMed: Database for most publications related to biochemistry.

RCSB Protein Data Bank: Database for all deposited biomacromolecule structures

OpenWetWare: "Wiki" site for biochemistry wet lab protocols and reagents.

PubChem: Database for chemical structures

PhosphositePlus: Database for known post translational modifications on proteins.