Code::Blocks is a development enviroment for Dreamcast.

About R1:

– upgraded to Code::Blocks svn (1.0 RC2 support dropped)
– no Makefiles needed
– includes Dreamcast sh-elf compiler (GCC 3.4.6)
– building romdisks within the IDE
– project files for most of KOS’ Dreamcast examples
– configuration program automatically sets Dreamcast compiler for you
– easy uninstallation

http://dcemu.co.uk/code-blocks-dc-dev-r1-73582.html