Before you download Vocal Bender (or a free alternative), understand what makes it special.
A highly reliable, free auto-tune and pitch manipulation plugin that includes basic formant controls.
Pitch Shifter or the native Flex Pitch engine provides granular control over individual vocal formants. Conclusion
Using Graillon 2 (free) combined with a free chorus and saturation can replicate 80% of Vocal Bender's sound.