osTicket v1.10 (stable) and Maintenance Release v1.9.15 are now available! Go get it now
After searching for hours I finally found out that there isn't anyway to add tickets to osTicket from a website nor from an application.
So that's why I created a MOD that adds a webservice to osTicket.
The download and documentation can be found here: http://www.cyberde.nl/software-en-US/osticket-soap-mod/
I've been testing it for a while now and it seems to be stable so why not release it to the community :)
Do you like this MOD and do you want to support me so that I can continue the development? Please make a donation.