Not so much for stocks, I mean like a better UI spreadsheet client that allows them to go to any period and see ledgers that are intuitively rendered and that lets them sort of experiment with the numbers so they can learn to maneuver things better. Like all their accounts, bills/recurring, paycheques, purchases. All rendered and projected or archived for easy traversal
Its like GTD: get everything out and externalized in an independant system or locus of reference and it takes most of the anxiety and human error out of it