Quantum Theory - quantum theory – Facts about quantum theory, Pictures, Video and quantum theory Information at Encyclopedia.com: a free, credible collection of encyclopedias.

http://www.encyclopedia.com/doc/1E1-quantumt.html

Quantum Physics Online - Quantum Physics Online version 1.0

http://www.quantum-physics.polytechnique.fr/en/index.html

Quantum Mechanics - Stanford Encyclopedia of Philosophy.

http://plato.stanford.edu/entries/qm/

Copenhagen Interpretation of Quantum Mechanics - Copenhagen Interpretation of Quantum Mechanics - Stanford Encyclopedia of Philosophy.

http://plato.stanford.edu/entries/qm-copenhagen/

Grains of Mystery 

http://www.faqs.org/docs/qp/

Quantum Physics - An introduction into Quantum physics.

http://www.hpwt.de/Quantene.htm

Quantum Cat Analytics - Quantum Cat Analytics. Various aspects of theoretical nanotechnology.

http://www.qcatanalytics.com/

The Departament of Quantum Mechanics of St.Petersburg University 

http://landau.phys.spbu.ru

Quantum Optics - Quantum Optics.

http://www.quantumoptics.it

Quantum Physics Primer - Quantum Physics.

http://theory.uwinnipeg.ca/physics/quant/node1.html

Laboratory of Quantum Theory of Metals - Home page shows main scientific directions and results of the laboratory in various branches of solid state theory.

http://www.imp.uran.ru/ktm_lab/index.htm

Everett's Relative-State Formulation of Quantum Mechanics - Everett's Relative-State Formulation of Quantum Mechanics (Stanford Encyclopedia of Philosophy).

http://plato.stanford.edu/entries/qm-everett/

Relational Quantum Mechanics - Relational Quantum Mechanics (Stanford Encyclopedia of Philosophy).

http://plato.stanford.edu/entries/qm-relational/

Measurement in Quantum Theory - Measurement in Quantum Theory (Stanford Encyclopedia of Philosophy).

http://plato.stanford.edu/entries/qt-measurement/

Quantum Reality - Quantum Reality.

http://www.quantum.bowmain.com/Quantum_Reality.htm

Visual Quantum Mechanics - Visual Quantum Mechanics.

http://www.phys.ksu.edu/perg/vqm/software

Examples in Quantum Mechanics - Quantum Mechanics Examples.

http://www.physics.csbsju.edu/QM/

Quantum Optics Group, University of Innsbruck - Quantum Optics Theory Group.

http://www.uibk.ac.at/th-physik/qo/