If you don’t know, Reddit updated their interface in February and made it worse by doing so. People who tolerated the older “new” interface can find a way to use that (at new.reddit) while the older interface is still there too (old.reddit).
Still, it seems like Reddit keeps making changes to drive away their older user base which hypothetically is drawing in new users (otherwise it seems a bit silly for them to be doing those changes).
There is a website of a person who catalogs Texas Instruments calculators. You can wonder over to the graphing calculator section to see how many different graphing calculators they made along with a bit of information on each one.
http://datamath.org/