Please understand that I work for a company full time. The libraries are maintained in my spare time and during some of my time off. These courses help towards hosting and app development costs, are only available for a few days, and need to be planned with at least a few weeks to a months notice. Course Summary IoAbstraction and TcMenu are libraries that make writing software for embedded boards easier, and generally more like writing for the desktop.
There is a common misconception in the electronics industry that Arduino is unsuited for professional development. As a result many companies try to use different, far more complex tool chains to develop software with far fewer ready made libraries available. What I would recommend however, is to carefully check all libraries that you are using, to ensure their license is OK for you project. Basically, for any commercial development where you intend to keep the source closed, do not use any GPL libraries (LGPL is fine as it has a linking exception).
I specialise in multithreaded network programming and embedded C++; with in excess of 20 years experience writing applications in both Java and C++. Having spent many years writing systems that need to communicate using differing protocols, often for exchange connectivity we are familiar with many topologies. In terms of multithreaded development we have built systems with low latency requirements using various methodologies. More recently using non locking bus style designs such as message bus, chronicle and disruptor.