The internet makes it more difficult for me to gauge what is known how much, or by whom, and the resurgence of anonymous writing by "some anarchists" or whatever moniker only makes answering this more difficult. My list tends towards (but isn't limited to) the anti-civ/green anarchist side of the spectrum.
A few years ago the Arctic Circle Collective (out of Seattle) was putting out some good shit. I fear most of it is lost now, but try surfing the tube to find some of it.
Baedan has some good shit that is authored anonymously focused on queering nihilism and anti-civilization perspectives, or perhaps negating and uncivilizing queerness?
"What Have We Done for Us Lately?" is an excellent (and provocative) pamphlet by dot matrix. Although dot might be well known here, many folks don't know of her, and I find this an excellent attempt at a (post-left?) non-identitarian anarcha-feminism.
Adios Prison is a pretty good read from the perspective of a bird nesting inside a prison and narrating the stories of the incarcerated.
I feel like David Watson/George Bradford is often overlooked nowadays, but I rather like a lot of his collection "Against the Megamachine". It is anti-civ, but without the sometimes dogmatic primitivism of some other authors.
I personally really like L Susan Brown's "Politics of Individualism", but some other people think it is boring. While it is written in an academic tone I dislike, her ideas were interesting to explore.
Statler and Waldorf had my favorite part of "Green Anarchy", taking the piss out of everything else. They were like trolls in the age of print.
Layla Abdel-Rahim's "Wild Children, Domesticated Dreams" is an interesting exploration of and attack upon education, childhood, parenting, and more. It is a nice combination of personal, academic, and uncompromising.
"Garden of Peculiarities" by Jesus Sepulveda is maybe one of the best. Similar to "Society of the Spectacle", it is a collection of theses whose target is civilization.