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I have found a custom openshift cartridge that install PHP 5.5 on openshift [openshift default is 5.4]
This will allow everyone to use Flarum on Openshift, a free platform as service, where you have ssh access and can install ruby, node.js and a lot more app types.
The following link allows you to create a custom PHP 5.5 cartridge on openshift, and of course allows you to install Flarum, wich requires PHP 5.5+
I'm not teaching how to use it, because it's very complicated and this was just to tell who want to try Flarum in openshift that there's a custom cartridge.
But for who want to know how to use, there are some good videos on how to use openshift on the web.
Source: https://github.com/laobubu/openshift-php5.5-cgi-apache.