Apps with 'Outbound firewall' feature

  1. Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on your computer.
  2. Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc. uMatrix: A point-and-click matrix-based firewall, with many privacy-enhancing tools.

    Discontinued

    The repository has been archived and the development has been stopped. https://github.com/uBlockOrigin/uMatrix-issues/issues/291

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  3. LuLu is the free, shared-source firewall for macOS. Its goal is simple; block any unknown outgoing connections, until approved by the user.
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  4. In Windows, you can use Windows Firewall to block or unblock certain applications, but it doesn’t offer an easy-to-use interface for its advanced features. Firewall App Blocker makes the process very easy!