We’ve just added DragonLace.Net to the free tools and libraries resource page.
Over the last year, John Marino has developed a substantial set of patches and now GNAT from GCC-4.6 passes the entire ACATS and gnat.dg testsuite without failure on FreeBSD, DragonFlyBSD, and NetBSD on both the AMD64 and i386 platforms. The version is called “GNAT-AUX” and it also builds on OpenBSD with only a single failure the same two platforms.
For more info: http://www.dragonlace.net/