Peter,
Happy to call them out..
The left most 2 boards is 1 set and is a an incarnation of the LocoHDL from Europe. A friend in Australia made it and it drives 16 Tortoise machines.
http://users.telenet.be/deloof/The next one is a TC64 from RR Cirkits
http://www.rr-cirkits.com/Very useful as It can be either 64 inputs or 64 outputs or a mix of both
On the second board the pair are effectively 2 of the same thing.
The board on top is a Digitrax DS54, 4 output driver board. The board under them is a CD unit to drive Snap coil turnout machines.
See here:
http://jean-louis.simonet.perso.neuf.fr/Ds54_CDU.pdfbased on the info in the PDF I made the boards myself and had the bards etched.. They are larger than normal and this was an error in the etching.. But works fine.
As I am using older H&M Snap coil machines and the output of the DS54 is not strong enough and was over heating resistors on the DS54.
In terms of what is available today off the shelf, the TC64 is available and I would highly recommend it.
The DS54 has been replaced by the DS64 from Digitrax.
I will be using the TC64 to drive signals mainly, but also use some of the ports as inputs from switches on the fasica.
The other 2 are make your own kind of things..
Hope this helps..