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You can leave the TI graphing calculator at home thanks to this web-based TI-83 and TI-84 emulator. As with pretty much all emulators, this depends on a ROM image from the actual hardware to work.

By default, you will first view the standard calculator used for math problems we face in our daily life. Click on the menu from the top-left corner of the screen and select ‘Graphing.’ ...

Rather than just cramming the Pi and a cheap LCD into his Numworks graphing calculator, [Zardam] integrated it into the device so well that you’d swear it was a feature from the factory.