Weka
What it is: Classic machine learning workbench from University of Waikato. Collection of ML algorithms with GUI for data mining tasks.
What It Does Best
Algorithm playground. Huge collection of classic ML algorithms. Compare decision trees, neural nets, clustering easily.
Educational value. Used in ML courses worldwide. Great for learning algorithm behavior and comparing results.
When to Use It
✅ Learning machine learning fundamentals
✅ Academic research and teaching
✅ Quick algorithm comparisons
✅ Small to medium datasets
When NOT to Use It
❌ Modern deep learning (outdated for that)
❌ Production ML systems
❌ Large-scale data processing
❌ Professional work (dated interface)
Bottom line: Classic ML education tool. Free and comprehensive but showing its age. Use for learning, not production.