I recently set up Privoxy, a powerful open-source web proxy focused on privacy and ad blocking. Here's my hands-on review after weeks of daily use: Privoxy runs smoothly on Windows, Linux, and Mac as a lightweight background service. I configured it quickly to filter ads, trackers, and modify HTTP headers right out of the box. It blocks obnoxious content across browsers without slowing my connection, and chaining with other proxies added flexibility for secure browsing. The configuration files are text-based and highly customizable, letting me tweak rules for specific sites. Fully offline capable once installed, it's perfect for paranoid users wanting control over web traffic. No mobile app, but desktop integration shines. My only nitpick is the learning curve for advanced filters. Free forever, it's unbeatable for privacy enthusiasts. Highly recommend!