TLDR: Pd build support has now been added!!! 
Howl is a virtualised build environment to build and run patches on OWL devices with your computer from the command line.
I released Howl v0.1.5-experimental today on git. 
Main new features:
- Added stability with more manual regression testing
- pd build support
- howl readconfig
- howl configure
- howl boxupdate
- howl boxversion
This release supports CPP and Pd patch languages only and is in need of testing within the community to improve and maintain stability. I will update the README with a quick demo video soon (I really hope i get the time for this soon).
You can find the release and the release notes here: https://github.com/bfabricius/howl/releases/tag/v0.1.5-experimental
If you experience issues that can be recreated, please use the issue tracker here: https://github.com/bfabricius/howl/issues
..or post questions here in the release thread or send an email to support_at_htaudio.de
You can find details on the history of the software and (current) development process in this thread: https://community.rebeltech.org/t/howl-self-contained-build-environment-for-owl/940/28
Cheers,