This will cover importing .OWM* files into Blender

Software Needed

Plugin installation

Download the OWMImporter plugin
Open blender and press space to open the search menu
Search for 'Show User Preferences' (you can just type user and use the up/down arrows to select the correct one)
Go to the Add-ons tab and click 'Install from File...' in the bottom of the window and double-click the recently downloaded OWMImporter.zip
Check the checkbox besides 'Import-Export: OWM Import' to enable the plugin
Make sure to click 'Save User Settings' in the bottom of the window
You can now close the window and proceed to the Import steps

Press space to open the search menu
Search for either OWMDL, OWMAP or OWMAT (depending on what file you want to import) and press enter
Select the correct file and click 'Import' in the top right corner (or double click it)

These are the custom file formats used by dynaomi's Toolchain and Blender Importer. More detailed description

The most commonly imported file. This file contains the model for a hero, weapon or any other object.

Materials.

This file contains an entire map/level. Usually very large files, so this will slow down your computer quite a lot.