Description: GnuPlot is a free, open-source graphing utility that can produce publication-quality 2D and 3D plots. It supports various plot types like line, scatter, histogram, boxplot, and contour plots. GnuPlot can also fit and manipulate data.
Type: software
Pricing: Open Source
Description: Wikipedia is a free, online encyclopedia written and maintained by a community of volunteers around the world. It contains over 50 million articles in hundreds of languages.
Type: software