Kano - The educational computer and coding kit for all ages
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
Bitsbox - Monthly code projects for kids
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
Harry Potter Kano Coding Kit - Build a wand. Learn to code. Make magic.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.