CafeTran

Just as a note to myself (and maybe Igor wants to copy this into the Help):

To install Java on Ubuntu Linux, simply enter the following three commands into the Terminal app:

sudo add-apt-repository ppa:webupd8team/java -y

sudo apt-get update

sudo apt-get install oracle-java8-installer

This adds another software repository to Ubuntu, but the risk of doing so is quite limited IMHO. It is surely much, much easier than installing it by hand (and – more important – to make it work).

It would be interesting to read about CafeTran's responsiveness on Linux. My guess would be that it resembles that of OS X, since Linux is really multi tasking too.

As CafeTran is based on Java, the main aspect is the responsiveness of Java, I assume. Depending on your needs for the remaining software, I'd recommend XFCE (Xubuntu) instead of the GNOME or KDE desktop, as I saw that the GNOME desktop needs a whole bunch of RAM (and AFAIR KDE is even worse).

Until now, while testing CafeTran on Linux I was still playing around with the VM Player that crashed sometimes, but I will further elaborate on this later on.

I think it depends on your RAM.
CT by default only uses 1 GB, so i you've got a decent amount of RAM it should rarely be an issue. (Only time I ever get an issue is if I have too many VMs open., but then I get a general issue, not an issue with CT.)
I used to get frequent crashes when using the web resources, so I stopped using them and started using Autokey instead - can barely remember a crash since.