Tools that can turn out code for OS/2 from a OS-9/OS-9000 environment (Cross compilation or other cross platform capabilities) or tools that can turn out OS-9 code from an eCS environment, or have some OS/2 specific utility or support even though they are primarily OS-9 executables. Also tools that allow interoperation-ability between OS/2 based systems and OS-9 systems be that in an interactive way such as networking and communications or simpler tools that allow the use or viewing of OS/2 related file formats in a OS-9 environment.
In addition tools that are or were available for both OS/2 and OS-9 may be tagged as OS-9 Tools as well even though the OS-9 executable has no specific OS/2 related utility or function. This is because merely the existence of the same tool on two or more platforms may not just help in porting an application from one system to another even if there is a version mismatch, it also help in the planning of a multi-target project that makes, or potentially makes use of the tool, effectively making the tool a part of the target API by proxy.
Note that while OS-9 itself is not UNIX, it is POSIX compatible and UNIX compatibility libraries, emulation layers and standard utilities either ship with the OS or are available from third parties, making porting generic tools fairly simple.
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