so turned out my buddy had last minute work-related obligations so his stream was moved to next week :( oh well, life happens
Neocities got rid of the .html extension from page links, and it shouldn't cause any issues if you still use the file extension... but during the conversion it broke some stuff, and at some point recently some other pages broke for some reason. Not sure why.
I don't know if this works outside of paid Office 365, but Excel online has collaborative editing (and you can link it to the desktop app if you're signed in and stuff)
Cryptpad if you don't mind some small jank whilst using it. It's basically google drive but less intrusive