Hello,
The Vassal module for All Are Brothers is released: https://vassalengine.org/wiki/Module:All_Are_Brothers:_Solferino_1859
This is a rather straightforward module. It has all scenarios included and ready to play.
For most unit markers, you have the option between adding the marker on the unit or using layers on the left on the counters.
The draw cup window already has all the available events chits with their correct number in the events decks. You only have to draw the required number and send them to the draw deck each turn.
Some player aids are not in the module so that you have to own the physical game to play.
Enjoy !