ASTROSURF
Astrosurf has been a reference for more than 20 years in amateur astronomers, because this website, whose interface was greatly modernized in 2017, combines everything that the enthusiast expects of such a medium. First, a website of dedicated web sites, in other words a free hosting space at all non-commercial astronomy sites! Each amateur can create its site, expose its work, exchange information, tips, put on-line work, talk about its association, etc. Then the particularly dynamic forum deals with all subjects, general astronomy, practice, visual observation, imaging, beginners' corner, new materials, etc. also professionals (astrophysicists, scientific journalists) exchange information, judgements, criticism, on a wide variety of subjects. There is also a wide selection of used materials and accessories, simplified ephemerides, an online shop, etc. Finally, and perhaps the most important: a very complete directory of astronomy clubs and associations is available, organized by departments!