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.

The graphing calculator reached a kind of technological plateau in the late 1990s. At least that's what Amazon consumers are saying. Right behind the TI-83 Plus is the TI-84 Plus, released in 2004.

Ti's graphing calculator technology is ancient -- older models, like the Ti-83 and 84 can't draw certain lines accurately, thanks to screen resolution limitations -- but they get the job done.

While the ubiquitous TI-83 still runs off an ancient Zilog Z80 processor, the newer TI-Nspire series of graphing calculators uses modern ARM devices.