Personally, I really like Zmudd. It has a small, one-time fee to use, but if you use it a lot it's worth it in my opinion.

If it still comes with a free trial period, I suggest you play with it and a few of the other free ones, and see what you like. It has everything to do with personal preference, so it would really behoove you to try as many as you can before you settle down, so to speak.