Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
Preschool - Preschool!
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
EduKittyABC - ABC Games for Kids – EduKittyABC is a fun tracing English alphabet educational app developed and published by Cubic Frog Apps.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.
Bini Super ABC - Bini Super ABC! Alphabet Games for Toddlers and Kids is a fun education app for those kids who want to learn letters and sounds of the whole alphabets.