You can download FCP TitleCleaner 1.5 for Mac from our software library for free. The program is included in Productivity Tools.
From the developer:
FCP TitleCleaner is a tool which makes use of the Final Cut Pro XMLs to clean text from subtitles with ease. The tool can be used to quickly clean titles from Final Cut Pro XML, eliminating duplicate/extra spaces, additional carriage returns, and more. TitleCleaner automates the tasks with a few clicks and allows you to perform a custom "Find/Replace" the specified words within the text. Furthermore, spellchecking is also provided.
You may want to check out more software for Mac, such as Sync-N-Link for FCP, exceLogger for FCP or FCP Versioner, which might be similar to FCP TitleCleaner.