Open Source solutions can cost more in the end that many Commercial off the shelf solutions, and often not deliver the results you want. Also there are many bloatware off the shelf tools like Mercury Quality Centre that can be just as painful as many Open Source Tools. You need to evaluate what level of maintenance you want to do and how committed you are to it.
What I really would like is just an access database. I've been working on one but i am having trouble with some of the coding. I'm basically teaching myself. I agree with Quality Center. Its a little more than my team needs.