Meta Search - Search your Desktop, Google Drive, Dropbox, Gmail, Evernote.
Plot Digitizer - All-in-One Tool to Extract Data from Graphs, Plots & Images
Findo - Your smart search 🔍 assistant across personal cloud ☁️
WebPlotDigitizer - WebPlotDigitizer - Web based tool to extract numerical data from plots, images and maps.
FYI - Find your documents, like magic 🔮
Engauge Digitizer - This open source, digitizing software converts an image file showing a graph or map, into numbers.