It is rare these days, that builds of FSO and FRED do not get released at the same time. In fact, if any, FSO builds are more common than FRED builds. If you go to the Source Code Forums, then to the Recent Builds subforum, you'll find a sickied thread called "CVS Builds" or something. Builds in that thread typically get released in several flavours. Standard FSO, Standard FRED, Inferno FSO, Inferno FRED, as well as alternate versions of all 4 of these, but configured for better performance under more modern processors, typically labelled as "optimized" or "P4". The last round of these to be released was on the 1st of this month, though they are hardly bug-free.