Mixxx is software for DJs that provides everything needed to create live mixes. It allows you to beatmatch songs and crossfade them together, like you would with turntables and a mixer. It runs without any extra hardware, and offers a wide range of advanced features including comprehensive MIDI controller and vinyl control support. To obtain the lowest latency and highest responsiveness, it uses hardware video acceleration and takes advantage of multi-core CPUs.
Cuberok is a music player and collection manager with a lightweight interface. It supports music collections, CUE sheets, Shoutcast/icecast streams, a Last.FM and Libre.FM scrobbler, downloading images for albums and artists from Last.FM, information about artists from Last.FM, and lyrics from LyricWiki.org, automatic ratings for songs, and support for many playlists at one time.