Interactive Fretboard Diagrams for Guitar/Bass. You can select tunings for individual strings using the arrows on the left. Clicking different spots on the fretboard could play the sound of the note that corresponds to that location. You can select from a list of scales and the selected one is shown on the fretboard.
Course Selection/Schedule Generator. Either it would be given your major and generate a list of classes from that or it could pull them from your degree audit. Classes would be in the boxes with Course, Days, and Time. Clicking on one adds it to the schedule in the matching timeslot. Classes that no longer fit due to classes that are already selected become grayed out.
Collection Manager for the Blizzard CCG Hearthstone. WOuld have a lits of all the cards sorted the way they are in game/by rarity. Checkboxes are there to mark whether you have 1 or 2 copies of each (or 0). After entering data, it performs queries and returns statistics about your collection and how much it would take to complete.