The pronunciation is like this: /tıgeıs/
Let's start with a brief history.
'Tigase' is a word which I invented at some time at the beginning of my work on the code. I am not good at creating cool names or logos and I did not want to spend too much time on it so I was just created kind of abbreviation from: 'Tiger Jabber Server'.
'Tiger' because then the Java5 with 'Tiger' code name was just release and Tigase is written in Java, so I wanted to highlight that it requires this particular version of Java.
For quite some time I thought that this word does not mean anything and it does not exist. As you can, however find out, I wasn't as creative as I thought. There is a place called 'Tigase' somewhere in the world and apparently this is also a woman name in some country.
As the 'Tigase' software name, however it has been invented as an artificial word with no particular meaning, therefore there is no a correct pronunciation for the word. I used to pronounce it as it is given at the beginning of the post but as I started to travel more I found out that lots of people say: /tıgase/ which is also fine and I actually like it more.
You can pronounce it any way you like and I am ok with it as long as I understand what you are talking about.