New to AddOn creation? - Usefull links and information

[Baertram]

If you want to add missing information, tools, ressources, addons, or correct the given one, please either write me a private message, or reply here to the topic.
Please do not post any off topic or start discuissions in here, but only add relevant information/sources.
After the info was corrected/added I'd be glad if you could delete your posts again so that the thread stays clean.
Thank you