"FX SCADA" is a freeware SCADA system (most of all external components are providing by GPL licence, but the core of it - by LGPL licence and it has freeware realization so). "FX SCADA" is a fully cross platform system, can be using under MS Windows (Mono 1.9, MS Framework 2.0 or higher), Linux (Mono 1.9 or higher), MacOS (Mono 1.9 or higher) and other platform, that providing a Mono (www.go-mono.com) realization by Novell. You can create self component, if it necessary, moreover it can be drivers, database managers and other simple and controls components. More information about "FX SCADA" you can give from www.fxscada.org web-site.