The purpose of the addon is to automatically turn keywords or phrases you specify into links. You set a list of keywords and a list of URLs to link them to, and the addon does the rest. A particularly useful featured of that addon is that you can use a csv data file to define all your link replacements.
For XenForo, we have two options to provide this kind of functionality:
Keyword Replace by Waindingo is unmaintained and unable to handle a large amount of key words. It also cannot use a csv data file like the vBulletin addon can.
Auto Link Replacer by ******* seems to have the functionality I need. Cannot use a csv data file, but at least it can export/import a list of replacements. That said, I'm not sure I can trust *******.