frsi
Fast Remote SVN Info
...frsi info -R --log file-relevant --propget svn:externals --xml <URL>
(The first run with the --log option will be slow as it needs to cache the entire repository log.)
Supports the standard SVN authentication options.
Windows Users:
This tool requires the subversion command line tools:
https://sourceforge.net/projects/win32svn/
Credits:
Subversion https://subversion.apache.org
win32svn https://sourceforge.net/projects/win32svn/
fast-svn-crawler https://sourceforge.net/projects/fastsvncrawler/