For Turntablists:
Serato will give you the best vinyl simulation, with lowest latency (good thing). That is the whole focus of Serato Scratch Live. A solid, reliable, low latency audio interface is part of the package with Serato, and that is a good thing for turntablist. If you are a turntablist looking for a digital solution, don’t waste your time anywhere else.
http://www.serato.com/
For the mix DJ that wants solid timecoded vinyl control as well:
Torq. Torq has a strong focus on time coded vinyl control, also has a dedicated low latency audio interface, but also has features for the more digital mix DJ. Torq can also be controlled by the M-Audio X-Session Pro, or the M-Audio Xponent midi controller, for those who want a more compact solution, without timecoded CD’s or Vinyl. Torq is relatively new on the scene, and does not have the long background of Serato.
http://www.torq-dj.com/
For those that want more flexibility, and the most features:
Virtual DJ, and other similiar programs, like Tracktor, DJ Decks, PCDJ, and the list goes on. With these programs, you are responsible for picking out an audio interface, and getting it to work reliably with your computer hardware. This will take more work. On the upside, you can choose from a LONG list of midi controllers, and have a lot of features. You will have a harder time getting time coded vinyl to work, but it can be done.
http://www.virtualdj.com/
If you are an MC, and you want your computer to mix for you. You want complete automation:
OtsAV. Currently no midi control ability at all, no time code ability. This really is for the MC that want’s his hands free. OtsAV is very reliable, with good sound quality. It’s good at what it does, which is automation.
http://www.otsav.com/
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Lecture Series on Software Engineering by Prof.N.L. Sarda, Prof. Umesh Bellur,Prof.R.K.Joshi and Prof.Shashi Kelkar, Department of Computer Science & Engineering ,IIT Bombay . For more details on NPTEL visit http://nptel.iitm.ac.in