What is the best open source SCADA software?

Following are few open source SCADA softwares:

1. Free Scada

Supported OS: Windows

License: Freeware

Free SCADA provides for end-users flexible tools for visualization and interactive control of any industrial process.

2. IndigoSCADA

Supported OS: Windows, Linux

License: GPL

A small footprint SCADA system entirely developed in C and C++ with multiple OS support and multiple front end protocol drivers.…