Bug
Tracking for all these tools has been been setup using the open
source bugzilla software system.
You can browse the reported bugs or post new bugs regarding these VHDL
tools using this link.
Mailing
Lists for all of these tools are maintained. In general each tool
has two mailing lists suffixed by either "-devel" for developers or
"-users" for users. These are subscription based mailing lists and are
relatively low traffic.