It's been a long time since the last release, but finally a new gap5 release is available. (There have only been very minor tweaks to other programs.)
Although I had hoped to have gap5 out of beta by now, our internal users are still finding several problems so it's justified to make another beta release. The full release notes can be found on the download page:
Currently we have a source tarball and pre-built binaries for 32-bit and 64-bit linux machines. We will have windows binaries soon I hope (they have been built, but need packaging up still). MacOS X will arrive a bit later, sorry.