Professional:

News:
arXiv.org preprints
The Extrasolar Planets Encyclopaedia
Astronomical news in Hungarian
systemic exoplanet blog

Databases:
Astrophysics Data System
Center de Données astronomique de Strasbourg
Dunlap Observatory Cepheid Database

Organizations:
Hungarian Academy of Sciences
Hungarian Space Office
Eötvös Loránd Research Network
HELAS - European Helio- and Asteroseismology Network

Institutes:
NASA - National Aeronautics and Space Administration
ESA - European Space Agency
University of Florida
ELTE - Eötvös Lorand University, Budapest

Projects, missions:
CoRoT - COnvection, ROtation & Transits plan�taires
Kepler - A search for habitable planets
PLATO - PLAnetary Transits and Oscillations of stars
CHEOPS - CHaracterizing ExOPlanet Satellite
TESS - Transiting Exoplanet Survey Satellite
Ariel - Atmospheric Remote-sensing Infrared Exoplanet Large-survey
MACHO - A search for MAssive Compact Halo Objects
OGLE - The Optical Gravitational Lemsing Experiment
EROS - Expérience pour la Recherche d'Objets Sombres
ASAS - The All Sky Automated Survey

Personal:

Organs and organ music:
 Pipe organs
Johannus digital organs
Organlive.com
Collection of my own organ performances

Other:
SZTAKI Dictionary
Google - the search engine
Wikipedia - the free encyclopedia
TWAN - The World At Night project