If you work with IBM Mainframes (z/OS, z/VM) on a Mac, you’ve probably noticed a glaring issue: every halfway-decent TN3270 terminal client costs money. Sometimes a lot of money.
We’re talking $50–$100+ for software that essentially emulates a 1970s text terminal. One popular commercial option even charges a recurring subscription just to let you type on a green screen. That felt absurd to me.
The free alternatives out there usually fall into three categories:
They require Java (slow, resource-heavy, and clunky on macOS).
They run inside X11 (no thanks).
