The most traditional of doors but most of which are mainly used as gates.
The term "ledge and brace door" is fairly open these days to interpretation, the original door was made up of broad timber boards which then had the ledges (rails) and bracers (diagonal rails) on one side, look at any truly old period property in the servants quarters and "below stairs" and you will find the real ledge and brace doors.
We at DirectDoors.com tend to promote the new version of the original doors in what is know as a "ledge and Brace" door but also the "Frame ledged and Braced" door, there is a subtle difference, the ledged and braced door is the one described above while the latter is similar in construction except it has full thickness vertical framework called stiles and a top rail to match, the lining is roughly half the thickness of the door and sits within the stiles and top rail but continues to have the vertical bracers on the reverse side.
The most important thing to note is that the Framed, Ledged and Braced door can have a proper mortice type lock and butt hinges fitted while the ledged and braced door can't and is therefore more suited as a gate or as a rustic alternative when (bearing in mind what's been written) you want to fit what would be "T hinges" and a Suffolk latch.
Just remember that although we treat these doors as "gates" we can also make any external ledged and braced door or framed, ledged and braced door to suit your requirements for all locations within your project.