Apps similar to Rocket Secure Host Access include z/Scope. It's paid, but x3270 is free. Other options are Microfocus Extra! and WND Terminal. In total there are four Terminal Emulators like Rocket Secure Host Access for Windows, Linux, Mac, the web and self-hosting.
z/Scope is a multi-protocol, multi-host terminal emulator that provides access to multiple terminal-based applications in a way that is familiar to every user, using a modern tabbed interface.
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x3270 is an IBM 3270 terminal emulator for the X Window System and Windows. It runs on most Unix-like operating systems -- e.g., Linux, Mac OS X, Solaris and Cygwin. It also runs natively on Windows.
Extra! is a Windows-based terminal emulator that connects users to IBM, UNIX, and Linux hosts. Extra! provides features you need to get the most from your mainframe applications.
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3270, 5250 and VT terminal emulator for Windows, Mac, Linux and self-hosted browser access, with session import and existing macro support.
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