OMC version 4.3
OMC 4.3 - a major refresh of the engine with a lot of code maintenance, bug fixes and features.
More detailed documentation forthcoming - along with general overhaul of command description and applet building guide.
The focus continues on building applets, with support for system services.
Standalone OMCService.service is also available but offers no advantage over an equivalent app.
An example app built with OMC 4.3 and also providing a system service is Xattr:
https://github.com/abra-code/XattrApp
Abracode.framework is no longer installed in /Libraries but is embedded in each applet, service and OnMyCommandCM.plugin. The framework is small enough by today's standards and embedding offers advantage of applets being self-contained and not requiring an installation.