We present the project of a parametric radiation source, the Tunable Parametric Laboratory Ultraviolet Source (TPLUS). We aim at building a prototype of such a source with an electron gun of moderate energy, 100 keV, interacting with a periodic multilayer within a high vacuum experiment chamber. The objective of this table-top facility is to provide users with a cost-effective, simple-handling mean to provide a tunable and intense radiation source in the extreme UV and soft x-ray ranges.