The website was temporarily removed for maintenance.
Here is the updated information:
PGM ChatRoom:
https://discord.gg/nncv82d
PGMMV Assets:
https://itch.io/c/696250/pixel-game-maker-mv
PGM YouTube:
https://www.youtube.com/channel/UCQe9dzPk71zHeHWqlsggS7A/playlists?