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.

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

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