If you are looking for zero-cost options, several reputable developers offer free pitch-correction plugins that provide similar real-time results: Graillon 3 Free Edition
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If you truly cannot spend any money, there are legal, free plugins that do exactly what Waves Tune Real-Time does: If you are looking for zero-cost options, several
MAutoPitch is a highly versatile, free automatic pitch correction plugin included in the MFreeFXBundle. It features standard auto-tune controls alongside creative extras like formant shifting and stereo expansion. It is highly stable and fully supported across all major operating systems. 4. Your DAW's Native Pitch Correction there are legal