The use of calculation software for pedagogical purposes in degree courses is a central tool for addressing disciplinary knowledge in engineering careers. Particularly, open source and free license tools generally have lower associated costs than their propriety equivalents while offering a similarly rich set of functionalities. This document presents a software tool called guiEditor designed to create script applications based on graphical interfaces for GNU Octave. guiEditor is a visual editor, which incorporates different functionalities aimed at allowing the development of graphical applications based on basic programming knowledge. Within the development environment it incorporates, in addition to the typical controls of the graphical interfaces, new controls that extend the script language used. In addition, as an example of the development environment potential, two applications created with guiEditor are presented. The assessment made by the students about a third application, called ltitool, which has been used in degree courses to address Process Control topics, is also presented.