Visnap7 Project ViSnap7 is a framework for an easy developing of PLC-Siemens HMI by Iñigo Gútiez (https://programacionsiemens.com)
The ViSnap7 core is a fork of Sharp7 developed in C# by Davide Nardella.
You can find more information regarding this project at http://snap7.sourceforge.net/
The idea of ViSnap7 is to be able to perform HMI without having to program each control.
Thus, after a very simple configuration (IP, Rack and PLC Slot) you will only have to drag and drop the controls, configure the memory address and that's it!