Various virtual turntable applications range from very simple mixers to comprehensive music production tool sets. Several of the most popular are Ableton Live, Serato Scratch Live, Native Instruments Traktor Pro 2, Image-Line Deckadance and Magix Digital DJ 2. They range in price from around $50 to nearly $450 as of 2015. Some online virtual turntables, such as Mixify.com, allow users to DJ locally or over the Internet with a browser-based application.
Magix Digital DJ 2 is the most accessible of the standalone applications. It is a cut down, entry-level version of Deckadance that is relatively light on features. This, combined with its low cost, make it an ideal virtual turntable for the beginner.
Mixify.com is another accessible application that has few features. It is primarily intended for very casual, occasional usage. As such, beginners who want to learn to DJ may be better off with an entry-level tool such as Magix Digital DJ 2.
At the other end of spectrum is Ableton Live. Although not initially intended as a DJ application, it has quickly become popular amongst DJs, particularly because of its intuitive interface for retiming audio files. Because it straddles the line between DJing and production, it's ideal for advanced users.