It brings me great pleasure to share that Steam Workshop is now part of your Dungeon Defenders experience. It's easier than ever to upload and share your maps and mods with the community!
If you're interested in making custom content for Dungeon Defenders, you've come to the right post. Whether you're new to the modding scene or you need some help getting your map up on the Workshop, you'll find what you need below.
Step-by-Step Guide to Uploading Maps to the Steam Workshop: http://dungeondefenders.wikia.com/wiki/Steam_Workshop
Beginner's Tutorial to the Dungeon Defenders Development Kit: http://forums.trendyent.com/showthread.php?22746-Dungeon-Defenders-Development-Kit-Basic-Overview
DDDK -- Making Your First Map: http://forums.trendyent.com/showthread.php?27016-DDDK-Tutorials-Your-First-Map
The Master List of DDDK Tutorials: http://forums.trendyent.com/showthread.php?22964-DunDef-Dev-Kit-Master-Tutorials-List!
Dungeon Defenders Wiki: http://dungeondefenders.wikia.com/wiki/Dungeon_Defenders_Wiki
If you'd like to publicize your map more, you can find an additional Steam Workshop discussion on our official forums! http://forums.trendyent.com/forumdisplay.php?80-Steam-Workshop-Discussion
And if you need help with the DDDK, you can ask our development team and the community in our Modding Discussion forums. http://forums.trendyent.com/forumdisplay.php?9-Modding-Discussion
I look forward to seeing and sharing your work with everyone!