Ellie is a nice webapp that allows prototyping of Elm-lang based applications. Elm is a javascript alternative, looks a lot like Haskell.
Track your vehicle using using a ODB dongle, nice way to have a connected car.
an iOS alternative that can probably do the job at last for some prototyping, or connected self: SensorLog by Bernd Thomas. I just need a PaaS to store the data and render them.