firsys FSXIO by: firsys .NET 5.0 This package targets .NET 5.0. The package is compatible with this framework or higher. 8,361 total downloads last updated 2/7/2022 Latest version: 5.0.7 FSXIO is a full-stack application framework used to build a self-contain web application the supports web socket, OPC, PLC interface, and databases.