At the risk of sounding like a broken record: I was developing Valdyas for its own sake, not even with the intention of writing fiction, years before I played, let alone ran, my first role-playing game. I can't say that too often or too emphatically, because I've had some nasty altercations with people who apparently knew better than I did and told me off, or even tried to blacken my name in public, when I "insisted" that Valdyas was not a game world.
Nevertheless we've been running games in it and in other parts of the same world.
Everything since 2007 is on my dedicated blog, Valdyis galsin. Khora's notebook was too extensive to put on the blog when everything was still on my main blog, and now I'm not going to move it from where it is.
Another campaign of Boudewijn's. We did run games between 1999 and 2007, and we do have writeups, but not in an accessible format. Note: these are in Dutch.
I ran this game at the rec.games.sf.advocacy Gathering in Mannville, Alberta, Canada. At the time, having all the PCs in the Guild of Anshen was scarily experimental.