z390 mainframe assembler emulator and run-time engine
The z390 program product is a Java-based portable environment that supports:
1) HLASM compatible assembler and linkage editor 2) zCobol compiler 3) run-time emulator to run your assembled/compiled programs 4) QSAM support for access to sequential files in EBCDIC and/or ASCII 5) zVSAM component to emulate VSAM operation 6) zCICS support for emulated interactive programs 7) Scripted Regression Testing facility
https://z390development.github.io/z390
There are a number of licenses and copyrights used by z390. Unless provided below, z390 is GPL v2 and copyright z390 Assembler LLC