General physics

• American Physical Society - with links to many other online physics resources [www]
• arXiv.org e-Print archive - online repository for scholarly papers [www]
• Lost Causes in Theoretical Physics - useful warnings for students [www]
• physics.org - guide to physics on the web [www]
• Physics Today - daily physics news [www]
• Physics World - daily physics news [www]
• Welt der Physik (in German) [www]

Probability and information - classical and quantum

• Dr Quantum: double slit experiment - great educational video [www]
• International Society for Bayesian Analysis [www]
• IQSA - International Quantum Structure Association [www]
• Probability Theory As Extended Logic - dedicated to one of its most eloquent proponents,
  the late Edwin T. Jaynes [www]
• Quantiki - quantum information wiki and portal [www]
• QubitNews - News and information from the quantum community [www]
• Qwiki - quantum physics wiki [www]
• Virtual Journal of Quantum Information - contains articles on quantum information from several
  participating source journals [www]

Consortia

• Cordis - EU research funding for QIFT (quantum information foundations and technology) [www]
• QUROPE - quantum information processing and communication research in Europe [www], to be replaced by QUIE2T [www]
• EuroSQIP - developing a superconducting quantum information processor [www]
• QAP - qubit applications [www]
• QUEST - Quantum Entanglement in Space Experiments [www]
• SCALA - scalable quantum computing with lights and atoms [www], to be replaced by AQUTE [www]
• SECOQC - development of a network for secure communication based on quantum cryptography [www]
• Q-ESSENCE (planned) [www]
• SOLID (planned) [www]
• CHIST-ERA (planned) [www]

Industry

• CQCT - multi-university centre for quantum computer technology, Australia [www]
• D-Wave Systems - developing the first commercial quantum computer [www]
• Durban Quantum City - the world's first city-wide quantum network [www]
• id Quantique - commercialising classical and quantum cryptography products [www]
• MagiQ Technologies - quantum solutions company [www]
• QCV - design and manufacture of quantum communication devices [www]
• QuantumWorks - innovation platform linking academic research, industry and government [www]
• SmartQuantum [www]

Research institutions

Europe and Israel

• CQC - Centre for quantum computation, Cambridge [www]
• GAP-Optique - University of Geneva [www]
• ICFO - Institute of photonic sciences, Barcelona [www]
• IQOQI - Institute for quantum optics and quantum information, Vienna/Innsbruck [www]
• MPL - Max Planck Institute for the science of light, Erlangen [www]
• MPQ - Max Planck Institute of quantum optics, Garching [www]
• QCI - Bristol quantum computation and information group [www]
• QIIC - Quantum information @ Imperial College [www]
• Royal Holloway, University of London [www]
• Tel Aviv University [www]
• TU Braunschweig [www]
• TU Darmstadt [www]

North America

• BQIC - Berkeley quantum information and computation center [www]
• CPI - Center for the physics of information, Caltech [www]
• Information Physics - University of New Mexico [www]
• IQC - Institute for quantum computing, Waterloo [www]
• IQI - Institute for quantum information, Caltech [www]
• IQIS - Institute for quantum information science, Calgary [www]
• Perimeter Institute for Theoretical Physics - includes an extensive repository of videotaped seminar talks
  and public lectures on quantum information [www]
• QIS - quantum information science @ MIT [www] 

Australasia

• Centre for Quantum Dynamics, Griffith University [www]
• CQT - Centre for quantum technologies, Singapore [www]
• QiSci - University of Queensland quantum information science initiative [www]
• QISS - Quantum information science and security, Macquarie University [www]
• University of Sydney [www]

Tools

• Conference Service - comprehensive listing of conferences [www]
• DOI system - resolves a DOI name [www]
• fooplot - free online function plotter [www]
• Mathematica online integrator - computes integrals online [www]
• Universitätsbibliothek Frankfurt (in German) - access to electronic journals [www]