What wonderful it would be merging Issue Tracker Starter Kit Beta and Time Tracker Starter Kit. That way 1) user(s) create issue(s), manager(s) turn issue(s) into one/many task(s) and assign it/them to staff. What do you think about this workflow?
There is a lot of free issuetracker software available, it almost all runs on Linux. Big ones like bugzilla for example. Some issuetracker systems can be run on windows as well, with mysql and php installed.
Why does it have to be free ? Don't you make money by developeing software ?
Buy FogBugz...
We developed BugSentry (www.bugsentry.com) because it helped us in our custom software work. Customers never reported problems, or if they did, the error report was vague or confusing. We built BugSentry to automatically capture the stack trace and send it to us. Automatic error reporting is fantastic.
Not free, but pretty cheap, especially since we host everything, so you can get back to writing software.