Plastik is an FM synth (or more accurately phase modulation synth) inspired by the Yamaha OPL chips found in Ad Lib and Sound Blaster soundcards in the 80's and 90's, renowned for its plastic sound. It should be noted, however, that even though Plastik was made to produce the same overall qualities as the OPL chips, and even has some of its unique features (the waveforms, the fixed vibrato and tremolo frequencies) it makes no claim whatsoever to be a complete or accurate OPL emulator.
Plastik is still work in progress, so if you find something that's wrong with it, or you have a feature request, feel free to contact me. (Leave a comment or fetch my e-mail address from the bottom of the page.)
Get it here: http://blog.gg8.se/wordpress/2010/01/23 -fm-synth/