I have a few things going:
Getting into Death, a collection of stories by Thomas M. Disch. The one called “The Asian Shore” is top tier. Check it out.
Riddley Walker by Russell Hoban, a post-apocalyptic SF novel written in its own unique dialect.
Super-Cannes by J. G. Ballard. Ballardian creepiness on the French Riviera.
Hothouse by Brian Aldiss. I read it in my teens; time for a reread.
Diseases of the Head: Essays on the Horrors of Speculative Philosophy, edited by Matt Rosen, an open access book you can download freely online. It’s “an anthology of essays from contemporary philosophers, artists, theorists, and writers working, broadly speaking, at the crossroads of speculative philosophy and speculative horror.”
Multicultural Dynamics and the Ends of History : Exploring Kant, Hegel, and Marx by Real Fillion, which is an attempt to rehabilitate speculative philosophy of history and “rearticulate a sense of the movement of history as a developmental whole,” with its own dynamics and telos.
Time and Free Will by Henri Bergson. Starts well:
We necessarily express ourselves by means of words and we usually think in terms of space. That is to say, language requires us to establish between our ideas the same sharp and precise distinctions, the same discontinuity, as between material objects. This assimilation of thought to things is useful in practical life and necessary in most of the sciences. But it may be asked whether the insurmountable difficulties presented by certain philosophical problems do not arise from our placing side by side in space phenomena which do not occupy space, and whether, by merely getting rid of the clumsy symbols round which we are fighting, we might not bring the fight to an end. When an illegitimate translation of the unextended into the extended, of quality into quantity, has introduced contradiction into the very heart of the question, contradiction must, of course, recur in the answer.