In this paper we present two software applications, one for simulation and design, and another for implementing Luenberguer Linear and High Gain observers. We show the interfaces and present a complete description of the software. * Autor de correspondencia: telefono: + 57 + 4 + 448 83 88 ext. 14165, fax: + 57 + 4 + 411 87 79, correo electronico: norha.posada@upb.edu.co (N. Posada)