To quote redsquirrel87:
"Unofficial" simply means that this versions have been compiled from sources taken from the official GIT, so, in other words, they are still under development. For this reason, they are not fully tested and/or 100% optimized for the PS3 (remember, Showtime is a multiplatform project and the author himself has admitted that his work is based on the Linux version and only later he adapts it for other versions) and so they may cause crashes or freezes in your console.
Try them only at your own risk.
Note: Due to the frequency of these builds releases, I decided to post them only in a way: the version that is installed into the "Video" menu with old ICON0.PNG
httpclient: Support relative redirects
textrendering: Rework face <-> family mapping to work better.
glw: Better routing of URL to texture load queues
Source: Showtime Repack Unofficial Builds