I write RPG stuff, usually for other people's games but a bit of it is standalone. Some of it can be viewed for free in your browser (though I do appreciate payment):
My semi-defunct blog also has examples of my work, see the index.
I am generally interested in material that presents the game world as a living thing, responsive to but not revolving around the player characters, but which is also structured in a way that prioritises functionality for the referee over a novel-like read. I play tRPGs to explore the unknown and navigate precarious social environments, not for tactical combat or baroque character build options.
As you can see from the above list, I'm also interested in using html and css to make more readable trpg documents than the more customary pdf. I am still a novice at this, but I'm happy to share what little I know if this is something that interests you.
If you would like to collaborate on a project, you can reach me on twitter or email me: hswift at gmail dot com