A program to construct a test superconducting electron linear accelerator (LISA) is in progress at Frascati INFN National Laboratories. The electron beam will be used to realize a FEL in the infrared region 11 - 18 μm in collaboration with a group of ENEA-CRE Frascati. The characteristics of the electron beam, the undulator and the expected performances of the FEL are described. Some future developments - energy doubling, energy recovery, third harmonic operation - are briefly presented. Such improvements aim to realize a high power, high efficiency FEL exploiting the features of a SC linac.