Mjograph is an XY (2D) graph editor that runs on Mac OSX and Java with the goal to provide researchers with a quick way to visualize numerical data and also create publication-quality plots.
This plot program is simple to use and quite handy. Compared to the famous OmniGraffleSketch, this one is even better and more suitable for scientific use. I hope the developers may consider to add a duel Y-axis overlay function, which is often used in scientific plot when plotting several parameters in function of time for example. Again, a great thanks to mjograph's author.
This program is simple and elegant yet flexible enough. Certainly something to closely watch. The only thing preventing me from using it to produce scientific plots can be summarized in two words: error bars.