Dj Tech Cdj 101
DJ Tech is not to be confused with DJ TechTools, the makers of the MIDI Fighter series, Chroma Cables, and Chroma Caps. There is no (longer) a product page for this discontinued device.
This is the Mixxx Wiki - 
Mixxx is a free and open-source DJ software.
Manual
Hardware Compatibility
Reporting Bugs
Getting Involved
Contribution Guidelines
Coding Guidelines
Using Git
Developer Guide
Creating Skins
Contributing Mappings
Mixxx Controls
MIDI Scripting
Components JS
HID Scripting