srtX 0.30 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. SrtX for Mac is included in Audio & Video Tools. This free Mac application is an intellectual property of willygroup.
The most popular version among the application users is 0.3. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This application's bundle is identified as com.willygroup.srtX.
From the developer:
Automatic editing for srt format subtitles for Mac OsX. Download any subtitle from any website and edit and syncrhonize just the way you want. The application allows you to make a lot of adjustements for any type of movie clip. Download it from sourceforge site for free
You may want to check out more Mac applications, such as Videora Motorola RAZR Converter, Aiseesoft MPEG Converter for Mac or iTunesLister, which might be related to srtX.