Support Incident Tracker (or SiT!) is a Free Software/Open Source (GPL) web based application which uses PHP and MySQL for tracking technical support calls/emails. $5/month
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Support Incident Tracker (or SiT!) is a Free Software/Open Source (GPL) web based application which uses PHP and MySQL for tracking technical support calls/emails (also commonly known as a 'Help Desk' or 'Support Ticket System'). Manage contacts, sites, technical support contracts and support incidents in one place. Send emails directly from SiT!, attach files and record every communication in the incident log. SiT is aware of Service Level Agreements and incidents are flagged if they stray outside of them.
Support Incident Tracker, or SiT is a free help desk program that is web-based. It is run using PHP and MySQL, both of which are available on all InterServer hosting accounts, making it fast and easy to get set up. The main feature of this system is the ticket creation and tracking, which is commonly used for troubleshooting issues. These tickets can have files attached to them to ensure all the information about a particular issue is kept in one convenient location.
This is a fairly simple ticket tracking system that will be sufficient for individuals and even some small businesses. One concern that many people will have with this solution is that it is not getting regular updates. In fact, the last big release was done way back in 2012. While this will still work, it seems unlikely that there will be new updates anytime soon, so should there be problems down the road, it may not get fixed.