DifferentFour 4+

Cricket Darts Chalkboard is an electronic chalkboard for your game of cricket darts. It records all of the details of your game and syncs across all your devices.

LearnGraphs helps people to visualise common graphs by playing with their variables and seeing the impact graphically and instantaneously. It also gives you intercepts and asymptotes.

HIITCounter is great for High Intensity Interval Training (including Tabata), allowing you to set the number of sets per exercise, as well as the training and resting periods.

Finally, WhenLast? is a great app for tracking frequent and rare events that are important to monitor (perhaps they are health related, or just of interest to you). You get great stats on the events.

Enjoy them all!