JOME (Java OpenMath Editor) is a self-contained software component written in Java (as a Java Bean), dedicated to the visualisation and manipulation of mathematical formulæ. Conceptually based on the well-known Model-View-Controller (MVC) design pattern, JOME naturally consists of three different entities: the Model, the View and the Controller, each itself a Java Bean. Thus, it is easy to add different kinds of representations (instances of the View component) of a formula (the Model), and to provide different of ways editing it (instances of the Controller component). Moreover, JOME uses OpenMath, a platform-independent standard for the representation of semantically rich mathematical objects, enabling in a meaningful way the exchange of mathematical objects between various software tools. These two characteristics make JOME a useful component for interactive and distributed mathematics.