SciDaVis is an open-source scientific data visualisation and analysis application. It provides an easy-to-use graphical user interface for creating and exploring data sets in a variety of formats. With SciDaVis, users can quickly visualise relationships within data sets, create stunning plots, and explore data interactively. It includes powerful tools for manipulating data, performing linear and non-linear regression, and creating data-driven charts and graphs. SciDaVis is a useful tool for researchers, students, and anyone working with numerical data.
This is the one SciDaVis is trying to copy. Good for professional use. Cost is the only drawback.
Latest discontinued version is 4.4.2 (2013) https://sourceforge.net/projects/graph/files/Graph/
Discontinued Discontinued but open source @ https://github.com/graphsketcher/GraphSketcher
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.