I have been constantly thinking recently: Your voice impacts a lot in your presentation, and it's one of those things that people generally take for granted. And it's not just your speak pattern and filler words that I'm referring to, but also intonation, fluency and so on. I would maybe risk saying that it can be as important as your appearance, or even more. (If you stumble every five or ten words, you can't really convey your ideas, can you?)

In this vein, is there a viable alternative for someone who wants to improve his own voice? I already thought about a voice acting tutor, but I generally prefer ways in which I could improve without having to pay a tutor.