Getdata Graph Digitizer 226 Key -

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.

For messy or low-quality scans where the auto-tool struggles. Getdata Graph Digitizer 226 Key

If the price is an obstacle, there are excellent open-source tools that perform the same tasks without the security risks of "cracks": This is perhaps the most popular alternative