I'm looking for an Open Source Issue logging and tracking web application that supports web services. I've looked around but I get mostly applications where you have to log on to the application to be able to log an issue.
I'm looking for an application where I would be able to subscribe to some service within my client application and be able to log issues from there.
I think Mantis will work out for you. The web service connectivity can be provided by making use of the MantisConnect-Project.