Mod Maker, a complete Creator / Editor for Mods for the SCS Software series of Truck Simulators. 
For a in depth look at Mod Maker click on Help File on website and check out the features..

Features at a Glance:
Create New Mod
Edit existing Mod
Import files / folders into Mod
Copy – Paste Import for files / folders
5 Mod Presets for Mod’s that you are working on
Edit .sii, .mat, .tobj files with or without external editor
Automatically keeps a one version back history on file edit (.sii, .mat)
Rename any file / folder
Use a Difference tool to see differences between original and Mod files
Merge two Mods with conflict checking
Un-Merge a Mod (remove merge files)
Create Cargoes
Remove unwanted created cargo
Edit AI Traffic
Search for files by name, partial name or extension
Automatically checks base and def scs archives for changes
Internal Base and Def scs extraction
Automatically copy Mod to Game Mod Folder
Create scs archive for use in-game, with or without password
Create Upload zip for Mod sharing
Game Log File viewer
Detailed Help file
Three interfaces Java Version, Windows Standard Version, Windows WPF Version
Plus more features to make Mod creation simple

If you have ver 0.9.3 installed you can use the patch, otherwise use full install

Mod Maker website http://haulinmods.com/modmaker

Credits:
SCS Software
DieHard