Forums

http://www.entomologie.de/Entomology forum
https://lepiforum.org/Forum about butterflies and moths including wide scope classification support
https://diptera.info/forum/Forum about true flies and midges with image gallery
https://forum.arages.de/European spiders forum
https://insektenfotos.de/forum/index.phpForum about arthropods, like insects and spiders
https://forum.pflanzenbestimmung.de/Forum plant identification