ChalkStash helps teachers discover classroom tools they may not know about, by grade and by need, like sensory tools or a wobble seat for students who focus better when they can move. Each find explains why it helps. The classroom exchange lets teachers post what they need or have extra of, so supplies go to another school instead of waste. For PTAs, PTOs and families: plan a teacher thank-you on one page, with the teacher's favorites, who brings what, surprise mode and a group chat. Free.