Lainchan is a vichan based image board with several unique features. I will post in a piece of the FAQ below. A couple unique things I noticed were that the /random/ page is a collection of random threads from the whole site vs. a dedicated /b/ board. The faq also mentions a built in language enhancer, and posting without a name you are given a random name.
“annoyingly elitist, reassuringly expansive” Britfags is a UK based imageboard. They allow anonymous posting and the board is fairly active.
Boards as of 2-18-22: