Free Tool

NetSpot is professional tool for wireless site surveys, Wi-Fi analysis and troubleshooting on Mac OS X and Windows. Collects data from all the surrounding networks and displays the signal level, channel info, transmit rate, vendor, security type, band and more. Thanks for recommending this one go to UniqueArugula.

Clipy is a simple clipboard manager app designed for macOS that provides quick access to reuse a long list of your copy/paste item history. Our appreciation for the suggestion goes to chrishunterdev.

Goss is a YAML-based tool for validating server configuration that allows the user to generate tests from within the current system state. Once written, tests can be executed, awaited or served as a health endpoint. old_noakes explains, "We wanted to use a 'different tool' to verify the outcomes of our Ansible run… we use [Goss] on all of our servers to validate they are working as expected. Think

Metasploit Framework is a widely used, modular penetration testing platform that can help you stay a step ahead of attackers. Allows you to write, test and execute exploit code using a suite of tools that enable you to test security vulnerabilities, enumerate networks, execute attacks and evade detection. Our thanks for the suggestion go to mclellac.

Learn and Test DMARC is a console that allows you to see the communication between email servers. It's a great way to understand what SPF, DKIM and DMARC are actually doing behind the scenes. Simply send an email to the provided address to begin testing your DMARC setup. freddieleeman suggests it's "worth a bookmark to test your own DMARC policy."

Firefox Multi-Account Containers divides your browsing into separate color-coded tabs. Allows you to set up proxies and then assign each proxy to a container. Thereafter, each request coming from a particular tab in the container will use the appropriate proxy. electricheat explains, "I use [it] all the time. Either for different accounts, or for having certain tabs use certain proxy

Skipfish is a security testing tool for web applications. It creates an interactive sitemap of the targeted site with a recursive crawl and dictionary-based probes, and then annotates it with output from various active security checks. The final report can serve as a good foundation for professional web application security assessments. Kindly suggested by mclellac.

Kismet is a wireless network and device detector, sniffer and WIDS framework that works with Wi-Fi, Bluetooth and some specialized capture hardware. The tool is compatible with most hardware and Bluetooth interfaces on Linux; built-in Wi-Fi interfaces on OSX; and remote captures on Windows 10 under the WSL framework. sliddis explains, "If you need open source, I can highly recommend kismet."