Map viewers

Map viewers are 3rd-party programs that analyze saved maps and display their contents in one easily-viewable graphic.

Map viewers are useful for finding Floating Islands and other resources, as well as providing a total World view not otherwise attainable. Some programs also provide advanced tools for checking map variables, checking Chest contents, and even altering maps in various ways.

TEdit
A powerful map editor and viewer for Windows.
 * Documentation at Curse

Note: TEdit's 1.3-compatible fork is a modification of the original TEdit, and is produced and maintained by a different author who does not offer an official binary version (the alternate download link provides third-party binaries).
 * TEdit Original (currently compatible with Terraria versions up to 1.2.4.1): https://github.com/BinaryConstruct/Terraria-Map-Editor
 * TEdit 1.3 fork: (compatible with Terraria versions up to 1.3.0.7): https://github.com/SBlogic/Terraria-Map-Editor



MoreTerra
A map viewer that generates PNGs which can be marked for map features, item locations, and Chests containing specific items.


 * Latest Thread
 * noroom Thread
 * UberJumper Thread



TerraMap
TerraMap lets you pan and zoom an interactive map and dynamically highlight items, items in chests, dungeons, NPCs, etc. It also supports headless, unattended world map image generation via command-line, complete with highlight capability.



Omnitool
An extensible, open source, tool collection that merges many conveniences of other tools into a GUI. Available in multiple languages, Omnitool creates world backups and maps worlds on launch. It comes with several plugins to provide more uses, and more plugins may be found on the TerrariaOnline forums.

Features:
 * Custom Made World Generators
 * Planetoids
 * Flatworld
 * Dungeon Arena
 * World Mapping
 * Saves .png map files in your terraria saves directory, for viewing with image viewers.
 * Clicking on a world listing also renders the world similar to Terraria or Terrafirma.
 * Worldify, creating a world from an image file
 * Available in nine languages
 * Can create a portable Terraria
 * Can render Worlds with 16x16 pixels per block, like Terraria

Terrafirma
Displays the output map in a scrollable window. View the map with textures and lighting. Inspect chests and signs with right-click. Quickly jump to spawn or NPC houses. A variety of Save options to showcase your creations.


 * Thread

Terraria Mapper
Original mapping program. Must be unzipped into the folder where Terraria keeps its world saves, usually Documents/My Games/Terraria/Worlds. Then click and drag the map file onto the executable.

TerrariaMapTool
Generates the map tiles and the data needed to display a Terraria world using the Google Maps API.

Python World Viewer
Similar to the other World Viewers, this creates a png map of a Terraria world. Written in Python, this viewer is compatible with Windows, Linux, and Mac operating systems. It also supports marking of points of interest, like altars, chests and crystal hearts.