This is a list of the 20 French verbs that have irregular future/conditional stems (the list appears twice on one page, so you can give each student a half sheet to save paper), and a set of flashcards.
To make split-page (Cornell) notes: Print the four flash card pages, fold them in half lengthwise, so you have an infinitive on one side and a stem on the other.
To make flashcards: Follow the steps above, then cut apart the five verbs on each page. You can then tape or laminate them together