• http://synecdochic.dreamwidth.org/282057.html
• https://goodinaroom.com/

online whiteboard - https://realtimeboard.com/

haven't tried

• https://hiveword.com/
• https://twinery.org/

linebreak adder/remover: http://blutz.io/etc/#

ink - scripting language? thing?

• guide - https://github.com/inkle/ink/blob/master/Documentation/WritingWithInk.md