Poseidon is a Chisel plugin that lets you flip a marathon map (M2 or Infinity) around the X, Y, or Z axes. Pretty slick, actually. Version 1.1 fixes a number of small bugs. This plugin is also available as part of the Chisel 2.1.6-enhanced package.

This program will allow you to fully customize your M2/M00 sound files. Check out its web page! b5 Update allows in-place editing-you can overwrite the existing file, if you want. (Thanks, Charles!) b6 update reactivates the code to verify class IDs.

This is one of the coolest tools to come along in a long time. It does just what the name would suggest... it allows you to view maps. It works a lot like Forge's visual mode... except it has a few extra features. Up and down motion is supported (shades of Pfhorte's viewer), and maps can be viewed fully-textured down to wireframe, with almost anything in between. It requires OpenGL, a 3D-rendering interface which is becoming quite common. OpenGL on a 3dfx card requires full-screen mode, which the Viewer doesn't support, but if you have an ATI Rage Pro or Rage 128 (or, according to Apple, ...

An update to an amazingly useful Chisel plugin. This allows you to see what tags are activated by which switches or chips, and what the resultant action is. 1.1 fixes the effect to work on merged maps as well as unmerged. 1.1.1 allows the overwriting of an exising Tag report. (If you've updated the tags, you certainly don't need the old report, do you?) Use this when new people join projects (to see what's already been done), use this when coming back to old maps you don't have notes for (you do keep notes, don't you?), use this as a last resort when playing scenarios that you can't find ...