VRChat resources and tutorials:

http://vrchat.wikia.com/wiki/VRChat_Wikia
https://www.youtube.com/channel/UC_9vjBF7PyfmG26KDcedXNQ/videos
https://youtu.be/qjyMFuKOpjs

Collection of 3D models and parts:
http://mikumikudance.wikia.com/wiki/Category:PMX_Models
http://seiga.nicovideo.jp/tag/MMD%E3%83%A2%E3%83%87%E3%83%AB%E9%85%8D%E5%B8%83%E3%81%82%E3%82%8A
https://mmd-pmd-mall.deviantart.com/

3D editing software:
https://www.blender.org/download/
https://sourceforge.net/projects/portableapps/files/Blender%20Portable/
https://vrcat.club/threads/cats-blender-plugin-0-4-1.6/

VRChat Petition:
https://vrchat.canny.io/feature-requests/p/standalone-windows-7-10-installer-without-steam