Anybody can contribute to this wiki; just create an account.
Full downloads of ALL data (except password hashes) are publicly available (see below).

Official NodeCore Links

GitLab: https://gitlab.com/sztest/nodecore
ContentDB (Release): https://content.minetest.net/packages/Warr1024/nodecore/
ContentDB (Alpha): https://content.minetest.net/packages/Warr1024/nodecore_alpha/
Discord: https://discord.gg/NNYeF6f
IRC: #nodecore on chat.freenode.net (bridged to Discord)
Contribution Guidelines: https://gitlab.com/sztest/nodecore/blob/master/CONTRIBUTING
Contribution Wishlist: https://gitlab.com/sztest/nodecore/blob/dev/WISHLIST
Weblate: https://nodecore.mine.nu/trans/

Other Reference Info

Network Latency Test Proxy: https://gist.github.com/Warr1024/a93e5ade411d674ed0a51a73f7f5eaed
cdbrelease CDB Release Automation: https://gitlab.com/sztest/cdbrelease
cdb2discord CDB Release Announcer: https://gitlab.com/sztest/cdb2discord
szutilpack Utility Modpack for Servers: https://gitlab.com/sztest/szutilpack