Description: Placehold.it is a simple image placeholder service that generates custom placeholder images for you. Specify image dimensions and background color to get a link to a placeholder image.
Type: software
Pricing: Free
Description: python(x,y) is an open-source mathematical plotting and data visualization library for the Python programming language. It provides a simple interface for creating 2D plots, histograms, power spectra, bar charts, errorcharts, contour plots, etc.
Type: software
Pricing: Open Source