Wavosaur is a free audio editor. You can zoom into a recorded note, select it, and use the "Pitch Shift" function. Combine this with ReaPitch (from the Reaper Plugins suite, which is free to download) for formant shifting.
Newtone excels at transparency. When pitch-shifting, the algorithms do a respectable job of avoiding "chipmunk" artifacts, provided you don't push the correction too far too fast. It sounds clean, modern, and professional. While it may not have the absolute granular control of Melodyne 5, for 95% of vocal tuning tasks, it is indistinguishable from the industry leaders. Newtone Vst Plugin Free Download -
Clean, simple, and zero latency.