otx is a tool used to disassemble Mach-O binaries on OS X 10.0-10.4. It is an enhancement on top of otool to add additional symbol information to its disassembled output.

The main site and SVN repository (http://otx.osxninja.com/) appears to be long dead. Is there a new maintainer (official or unofficial) or someone hosting the code to disassemble Mach-O binaries on legacy macOS systems?

I posted a similar question on Reverse Enginerring Stack Exchange (Is there an up to date fork of otx?), but it did not generate any activity. To keep this question in-scope, I will only focus on the older versions of OS X, but I am also interested in a version of otx that works on any OS X version.

  • We can only prove the positive, not the negative. So the easiest way to answer this would be to create one.
    – wizzwizz4
    Dec 19, 2016 at 13:48
  • @wizzwizz4 I could fork it myself, but I don't have the original source. I guess this is a question to see if anyone knows of a fork that is still actively being maintained or has been updated in the past few years or so.
    – JAL
    Dec 21, 2016 at 16:08

1 Answer 1


Technically, the most up to date modern fork of otx is being maintained by Zhi-Wei Cai on GitHub here. v1.7: Build 566 or a fresh clone of master should work on any modern OS X system.

But that's not why we're here. This is Retrocomputing Stack Exchange after all. The most recent fork of otx which works on legacy OS X platforms is probably the linuxaged fork. I also realized an archive of the original svn server is available on the Wayback Machine. This provides otx 0.16b which works for reverse engineering PowerPC binaries.

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