I know Eclipse to be a Java development environment and AccuTerm is terminal emulation software.   Sage CRM has the concept of free form notes that can be added to any of the main entities of the system.  The best approach to using Mobile will depend on the devices being used (Tablet vs Phone), the need for offline and the need to use the integration with the accounting system.  A good place to start with exploring integration with Sage 50 in North America would be with https://mycrmmanager.com/ or https://www.greytrix.com/

That was very helpful. I will look into the sites you attached. Thank you!