Many APM vendors are offering a free version of their tools for evaluation. This model allows organizations to use the product in its own IT environment and realize performance management benefits:
While not as functional as the “premium” pay versions, they provide basic core functionality for understanding performance management. They also offer a point of entry to performance management for those organizations that either couldn’t afford traditional performance management or that lacked the expertise to get up and running with a paid product.
Check out the full post, There’s No Such Thing as a Free Lunch, But There is Free APM, from Aberdeen.