I got kinda intimidated with the Asciidoc toolchain that I instead just wrote a bit of Clojure to call the Java AsciidocJ API. A tiny script that did what I want (make Reveal slides) and it's simple/straightforward and I guess crossplatform :)
There is also Orgmode and Texmacs - but I don't really like that the markup is kinda "locked" to an editor. For instance I've done stuff with Orgmode for ages, but it breaks between Emacs major versions and you can't really export it without having Emacs. I also feel like I'm in effect locked into the platform
Texmacs actually looks fantastic, but I'm nervous putting all my beans in that basket
So better than even a command line thing
If you want a GUI then I'm guessing AsciidocFx
https://github.com/asciidocfx/AsciidocFX
(haven't tried it myself)
There is also Orgmode and Texmacs - but I don't really like that the markup is kinda "locked" to an editor. For instance I've done stuff with Orgmode for ages, but it breaks between Emacs major versions and you can't really export it without having Emacs. I also feel like I'm in effect locked into the platform
Texmacs actually looks fantastic, but I'm nervous putting all my beans in that basket