If you are looking for something capable of symbolicating your crash log on Linux (and possibly Windows) without any XCode involved, you could try the open source tool over here: https://github.com/monal-im/DebugTools/tree/master/tools/symbol_extractor#symbolicator

It can even symbolicate all missing symbols of iOS system libraries. Internally it uses an sqlite3 database containing all symbols and addresses/library names. You can fill the database yourself with the C++ tool provided. A link to a repository containing symbols of various iOS builds is included in the README, too.

If you are using the excellent KSCrash crash reporter (https://github.com/kstenerud/KSCrash) this tool is capable of filling in all missing system symbols for you.

Disclaimer: I wrote that tool.