Xming - An X Window System Server for Microsoft Windows.
Plot Digitizer - All-in-One Tool to Extract Data from Graphs, Plots & Images
VcXsrv - Download VcXsrv Windows X Server for free.
WebPlotDigitizer - WebPlotDigitizer - Web based tool to extract numerical data from plots, images and maps.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Engauge Digitizer - This open source, digitizing software converts an image file showing a graph or map, into numbers.