The Witchfire Trilogy -- Iron Kingdoms
The campaign is of course set in the Iron Kingdoms, a low magic blend of heavy machine combat and medieval fantasy. If you have not had the chance to read the excellent source material then I highly recommend you pick some of it up. The original hardcovers are out of print and it was a bit expensive to pick them all up of Amazon but now you can get the .pdfs at paizo.com for much cheaper.
My family and I have gathered together the books and most of the miniature line that corresponds to the trilogy in order to play through this trilogy as it came out in 2001. I also have cobbled a few bits of my own to personalize and expand the campaign. I hope you enjoy reading of our exploits.