Now Oracle Goldengate 19.1.0.2 can manage 19c AIX Oracle DB instance. Linux has been out for a long time. Sparc is also available. For Windows, HPUX, patience …
$ ggsci Oracle GoldenGate Command Interpreter for Oracle Version 19.1.0.0.2 OGGCORE_19.1.0.0.0_PLATFORMS_190823.0013_FBO AIX 7, ppc, 64bit (optimized), Oracle 19c on Aug 25 2019 22:10:20 Operating system character set identified as US-ASCII. Copyright (C) 1995, 2019, Oracle and/or its affiliates. All rights reserved.