I didn't see anything in the rules and regulations about posting products, but if this is against the rules I apologize.
I just added a new Android app to the playstore that can help you learn the Illustrious 18
Its for HiLo counters for multideck tables. If there's enough interest over the next few weeks I'm going to add other counting sytsems in and rules options.
It's $1.99 but considering the .1-.2% EV gain from learning these, a good card counter will make that back in less than 2 hours worth of hands at a $25 average bet.