Question: I already tried this <http://hg.orfeo-toolbox.org/OTB-Qgis-plugins/> repository and couldn't get it...

This guy seems to have it: <http://www.elance.com/samples/orfeo-toolbox-qgis/24111664/>

Answer: 
I did it following this: <http://wiki.orfeo-toolbox.org/index.php/Quantum_GIS_access_to_OTB_applications>
I've been struggling trying to make OTB work on QGIS 3.18.1-Zürich running on a GNU/Linux Debian machine.
I finally succeeded, so I guess I'll share my experience here, since it wasn't really obvious.

I have all OTB packages installed by the apt package management system, and the binaries and libraries are located in /usr/bin/ and in /usr/lib/x86\_64-linux-gnu/otb/applications/

I enabled OTB in the QGIS options dialog box:

[![QGIS options parameters dialog box](https://i.stack.imgur.com/OgAMK.png)](https://i.stack.imgur.com/OgAMK.png)

The **tricky part** was **not** to put "/usr/bin/" in the "OTB directory" ("Répertoire OTB" on my French version) where the OTB binaries are actually located, but simply "/usr/".
It took me a long while to figure this out.

Hope this may help others.