Terrafirma is mapping tool for Terraria. It gives block information in the statusbar as you hover, lets you zoom and pan around your map, and can save your map out as a png. New features include textures and lighting.
Valve Hammer Editor is tool that you can create your own maps with. You may have to download some models so you have that done. Or if you already have some models you can take them to. You have to have other things to like wads etc etc to it so it wi
VTF Explorer is a tool for viewing and extracting Source Engine format texture files (.vtf's - Valve Texture Files). Program allows you to view whole folder full of VTF's either from hard disk or .gcf file as a collection of thumbnails. You can view