I relied on my public library for internet access for years ... luckily though, I had my own computer. Do any libraries have some kind of persisted 'virtualize

I relied on my public library for internet access for years ... luckily though, I had my own computer. Do any libraries have some kind of persisted 'virtualized' environment that migrated between public-use machines? For example, at the library I was at, you could not install software you needed - things were pretty locked down. And one day you may use machine #5, another day it might be machine #10. Imagine you wanted to teach yourself programming. A few tools would need to be installed. I don't see how this would be possible in the library I was in (using public computers).