A support library of ADempiere package using the same definition of https://developer.android.com/topic/libraries/support-library, note that this repository don't want replace ADempiere ERP, instead just want create a tool box of all ADempiere functionalities that is was write with a old implementation and is not part of adempiere road map for change.
A result for this library is published here: https://repo1.maven.org/maven2/io/github/adempiere/template-support-legacy/1.0.0/