Grapher is a powerful and easy-to-use data visualization and graphing application. It allows users to create interactive graphs, charts and diagrams from virtually any data source, including spreadsheets, databases, web applications, APIs, and more. With Grapher, users can quickly and easily create professional-looking visualizations, including 2D and 3D graphs, scatter plots, histograms, and more. Grapher also offers powerful tools for data analysis and manipulation, allowing users to identify trends, compare data points, and explore correlations. Additionally, Grapher offers a wide range of customization options, allowing users to customize their graphs to their exact specifications.
Latest discontinued version is 4.4.2 (2013) https://sourceforge.net/projects/graph/files/Graph/
The graphing calculator is much more versatile and "realistic" than Grapher, which is amazing for an application that is effectively only mathematical.
Discontinued The project seems to be no longer developed. The latest version, 2.7.10.0, released in June 2015, can still be downloaded from the official website.