I have a derive.exe from 1996 that I still use. TI's calculator, as an incredibly fast windows app that's like 20% of wolframalpha.
And to think on all "modern" OSes you can't even do that. Neither Android nor IOS let you do this in any way shape or form. Even with portable webapps it doesn't work, as webapps go offline. And microsoft clearly wants to create this situation too (last brute force attempt was windows home)