Sources

Where does all of this come from?
I'm not much of a writer or a creator; I'm more of a "collector" of cool things. The Steampulp world is a collection of cool things from a bunch of sources that I've come across, modified and adapted to fit together.
* 50 Fathoms, by Shane Lacy Hensley
* 50 Fathoms Companion, by Paul "Wiggy" Wade-Williams
* A Dozen and One Adventures, by Steven Kurtz
* Aces and Eights: Shattered Frontier, by Jolly R. Blackburn
* Andoran, Spirit of Liberty, by Hal Maclean
* Assassin Mountain, by Wolfgang Baur
* Avalon, by Rob Vaux and John Wick
* Caravans, by Rick Swan
* Castille, by Patrick Capera
* Cities of Bone, by Steve Kurtz
* City o' Gloom, by Shane Lacy Hensley
* City of Delights, by Tim Beach
* Corsairs of the Great Sea, by Nicky Rea
* Cthulhu by Gaslight, by William A. Barton
* Dark Markets: A Guide to Katapesh, by Stephen S. Greer and Amber E. Scott
* Deadlands, by Shane Lacy Hensley
* Faces in the Smoke, by Chad Bowser
* Fire and Brimstone, by John Goff
* Five Fingers: Port of Deceit, by Douglas Seacat and Bryan Cutler
* Fortress o' Fear, by Matt Forbeck
* Ghost Town, by Dave Blewer and Piotr Korys
* Golden Voyages, by David "Zeb" Cook
* Heart of the Jungle, by Todd Stewart
* Iron Kingdoms World Guide, by Brian Snoddy and Matt Wilson
* Irrisen, Land of Eternal Winter, by Mike Shel
* Isles of the Shackles, by Mike Shel
* Land of Fate, by Jeff Grubb
* London by Night, by Brian Campbell
* Montaigne, by Kevin Wilson
* Nyambe, by Chris Dolunt
* Old West, by Ann Dupuis
* Osirion, Land of Pharaohs by James Jacobs
* Outlaw, by Matt Forbeck
* Perdition's Daughter, by Shane Lacy Hensley
* Qadira: Gateway to the East, by Brian Cortijo
* Ravenloft, by Andrew Cermak
* Ravenloft Gazetteer, by Andrew Cermak and John W. Mangrum
* Red Steel, by Tim Beech
* Rippers, by Chris Dolunt
* Ruined Kingdoms, by Steven Kurtz
* Salt and Sea Dogs, by Travis Stout
* Sargava, the Lost Colony, by JD Wiker
* Savage Baronies, by Tim Beach
* Scarrport, by Matthew J. Hanson
* Secrets of Kenya, by David Conyers
* Secrets of San Francisco, by Cody Goodfellow
* Secrets of the Alubelok Coast, by David Reeder
* Secrets of Xen'Drik, by Keith Baker
* Serpent Kingdoms, by Ed Greenwood
* Six-Guns and Sorcery, by Edward Bolme
* Steamcoach, by Greg Detwiler
* Taldor, Echoes of Glory, by Joshua J. Frost
* The Agency, by John Goff
* The Edge of Midnight, by Rob Vaux
* The Great Maze, by Robin Laws
* The Horde, by David "Zeb" Cook
* The Imperial Age: London, by Scott Rhymer
* The Jungles of Chult, by James Lowder and Jean Rabe
* The London Guidebook, by Lucya Szachnowski and Gary O'Connell
* The Naked City, by Rob Vaux
* The Pirate's Guide to Freeport, by Patrick O'Duffy
* The Road to Hell, by Paul Beakley and John Hopler
* The Smoke: 1867, by Scott Rhymer
* The Way of the Brave, by Fred Jandt
* The Way of the Dead, by Fred Jandt
* The Way of the Gun, by Steve Long
* The Way of the Huckster, by John Hopler
* The Way of the New Science, by Lucien Soulban
* The Way of the Righteous, by Fred Jandt
* Things to do in Denver When You're Undead, by Brandon Thorn
* Vodacce, by Ree Soesbee
In addition, the Steampulp wiki contains numerous photos and artwork that I've collected from the web and adapted. I claim no credit for these photos and art - I've just run a few very simple photoshop filters to give them a consistent feel. Please notify me if any of these photos or artwork belong to you and you'd either like a credit or for me to take the art down, and I'll do so.
The maps, however, I can claim credit for.