Although the popularity of the "Doom" games dropped with the release of more modern first-person shooters, the game still retains a strong fan base that continues to this day by playing competitively and creating WADs, and "Doom"-related news is still tracked at multiple websites such as Doomworld. Interest in "Doom" was renewed in 1997, when the source code for the "Doom" engine was released (it was also placed under the GNU General Public License on October 3, 1999). Fans then began porting the game to various operating systems, even to previously unsupported platforms such as the Dreamcast. As for the PC, over 50 different "Doom" source ports have been developed. New features such as OpenGL rendering and scripting allow WADs to alter the gameplay more radically.