TJ Duckett. **Edit, he was acquired in a trade not as a free agent**
Al Noga and Tim McGee, our first two free agent signings of all time (1993). Both spent a single season with the team.
I love the QB situation in the sense that nobody is making a ton of money so there won't be financial pressure to start one QB over another. Yes, Fitzpatrick is the more accomplished player but if Heineke wins the job, there won't be a salary consideration hanging over the coaching staff's head. The best player will start.