FL Studio can also be used as a VST instrument in other audio workstation programs. Image-Line also offers other VST instruments and audio applications. FL Studio is used by hip hop and electronic musicians and DJs such as Afrojack, Avicii, Boi-1da, Seven Lions, 9th Wonder, Metro Boomin and Southside, as well as Dyro, Madeon, Porter Robinson and Martin Garrix.
FL Studio can make custom/composed sparta bases and other music. It can also make sparta remixes and mashups. Tomiato64, GSR, Aduburyus, CloudNinja, and PiaNO! are just few examples of sparta remixers who uses Fl Studio. This program also started Gross Beat, Free Filter, Fake Percs, decent vibrato, and NewTone (FL Studio version of melodyne) in sparta remixes.
Official and legal download: http://www.image-line.com/documents/flstudio.html
Note: the demo can be used to create projects with many of the main features of the program but you cannot reopen project files (flp files) saved.