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This is perhaps the most popular alternative. It is free, web-based (no installation required), and incredibly powerful. It handles various chart types and is widely cited in academic papers.

If the price is an obstacle, there are excellent open-source tools that perform the same tasks without the security risks of "cracks": Getdata Graph Digitizer 226 Key

Supports Cartesian, Polar, and Logarithmic scales. This is perhaps the most popular alternative

Easily move data into Excel, TXT, or XML formats. The Risks of Using "226 Keys" from Unofficial Sites web-based (no installation required)

Another reliable open-source option for those who prefer a simple, functional interface.

A robust, open-source desktop application that provides a similar workflow to GetData.