Shuouma has released the source code for all the servers he's coded to date; this includes the server software for Planet Ring, ChuChu Rocket!, PBA Tour Bowling 2001, Starlancer, The Next Tetris, and Maximum Pool (master server). This software has been released as open source under the MIT license and can be freely used, copied, modified, or distributed. This is a huge step in making sure all the games revived so far will be online for as long as the internet still exists. Long live Dreamcast!
All the source code can be found on the new Server Software page in addition to any other Dreamcast server software and/or source code that has been released to date.