Here are some of tested and suggested mods for Die by the Sword. If you have more that you'd like to share here is the exact place.
Note. It is better to test each mod with gog installer first before you add new one to this topic.

0. Xtended
Xtended is a modification of Die by the Sword: Limb from Limb. It fixes bugs, adds new features and modifies many aspects of the game.
http://forum.megamods.de/viewtopic.php?f=3&t=64

1. ModManager v1.1
This Tools manages all DbtS Mods for you. Just one click will de-/activate the mods. You don't need to modify ATD files anymore, when installing a mod.
http://www.megamods.de/_data/parts/dl.php?file=41

2. Battlefield Creator v1.0
Ever wanted to set up your own battles in DbtS with up to 40 creatures? Now you can!
http://www.megamods.de/_data/parts/dl.php?file=42

3. HazData Common Lib
This is a common texture, data and script library used by some of my mods and by the Battlefield Creator.
http://www.megamods.de/_data/parts/dl.php?file=43

4. HazzardModpack v1.0
This is an archive of all mods i've made for DbtS 'til now. (aBattle, aBridge, aDeathA, aiLavapit, aPropBase, aSkyFight, cHexler, cKnight, cScreamer, PlayUnlimited) Fully ModManager ready!
http://www.megamods.de/_data/parts/dl.php?file=40


For more maps, levels, characters, etc. visit eg. http://www.megamods.de/