While I definitely need to keep practicing with it, especially for creative reasons and not just pitch-correction, Melodyne is probably the most popular and well-known pitch correction software for a reason. While we all need to practice our pitch and not rely on software as a crutch, Melodyne does the best job in helping you stay on pitch and not sounding like an alien!
It works! if you're singing at all, than you need to get pitch-correction software. Make sure you try this out!