The main GDB website is at sourceware.org/gdb/. It is supplemented by the less formal GDB Wiki at sourceware.org/gdb/wiki/.

The GDB developer community communicate through the GDB mailing lists and using IRC chat. These are always good places to find solutions to problems.

IRC is channel #gdb on irc.freenode.net.

The main mailing list for discussion is gdb@sourceware.org, although for detailed insight, take a look at the patches mailing list, gdb-patches@sourceware.org. See the main GDB website for details of subscribing to these mailing lists.