Testing your knowledge of open source?

Open source software is a great concept for liberating your software from a proprietary company. And open source has contributed much to the foundation of testing as we know it. But can open source testing scale to meet your needs? We believe JUnit and Ant for instance are great tools we can use every day for "small" scope or single function tests. However, we find that the more we try to extend these processes beyond a single function test, the more manual or fragile these tests become to the business. Still, many of you are in departments and companies that are realizing some benefits from open sourcing other IT aspects of your group - for instance switching to Linux, open app server/database strategies. Companies can try to save money by "equipping" developers/QA teams with the open toolset. Since these tools are pretty much code/compile type testing, we feel there is a cost to them -- basically the cost of coding and maintaining a testing solution in an open tool.

Is open source testing buy vs. free? Or is it build vs. buy? Tell us about your experiences or insight on this!