Below are the tools one would require to get plasmoids running as well tips on optional tools surrounding development that might be interesting to use.
What QML is and how to write applications using it. Useful resources include:
Software and library requirements
# For running simple qml applications that don't import org.kde.plasma* sudo apt-get install qmlscene # For a host of tools including: # /usr/bin/plasmoidviewer for testing and view plasmoids sudo apt-get install plasma-sdk