Visualization&Figures
GNUplot http://www.gnuplot.info/ Scitific Figure Tool
Demo of Dr. Ming Gao (The font "Times-New-Roman" should be embedded in pdf)
Gnuplot supports many different types of 2D and 3D plots. Please see demos here.
Wikimedia collection of figures made using gnuplot
Library of Gnuplot examples
Awesome Matplotlib & Pyplot Demo and Examples: http://matplotlib.org/gallery.html
Ggplot&ggplot2: http://ggplot.yhathq.com/ http://ggplot2.org/
Gephi https://gephi.org/ Demo Social Network Visualization
Web Latex Editor https://www.writelatex.com/ http://www.codecogs.com/latex/eqneditor.php
Word Could http://tagcrowd.com/ http://www.tagxedo.com/app.html http://worditout.com/word-cloud/make-a-new-one
Draw.io https://www.draw.io/