The SDF bugzilla system is located here. Use the package 'sglr' and 'pgen' to report bugs in the core SDF system. 'sdf-meta' for IDE bugs and 'unknown' if you just don't know.
SDF is an open source project, originating from CWI in the Netherlands as part of The Meta-Environment. It is an independent piece of software now, developed by and contributed to by several people from CWI, TU Eindhoven, TU Delft and others.
The current developers/maintainers are:
Also not that SDF depends on other open source software such as the ATerm library and the UPTR (pt-support) parse forest representation library.
Also not that previous versions of SDF (as implemented in Centaur LISP) have been done by other people: