NMR
Biological Magnetic Resonance Data Bank (BMRB): A repository for data from NMR spectroscopy on proteins, peptides, nucleic acids, and other biomolecules
Structural Biology Tools: Useful tools for acquiring, processing, analyzing and publishing structural biology data
Rowland NMR Toolkit: A software package for processing multidimensional NMR data and a platform for the facile implementation of novel NMR data processing methods
Connjur: An open source integration environment for biomolecular NMR data analysis
NMRbox: A virtual machine that comes pre-configured with a wide range of software for bio-NMR based on CentOS
Protein NMR: A Practical Guide: A site with useful information about protein NMR
CD
Dichroweb: An on-line analysis for predicting secondary structure from circular dicroism spectra
K2D3: A program for estimating secondary structure from CD spectra
How to Study Proteins by Circular Dichroism: (Article)
SPR
SPRpages: Site devoted to SPR with lots of useful information and links
ITC
Isothermal titration calorimetry of protein-protein interactions: (Article)