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.
Open Source Security focuses on whatever topics are hot in security, as well as a broad range of areas including IoT, application and operational security, cloud and devops. Hosts Kurt Seifried and Josh Bressers bring a unique open-source spin to each conversation, and oducky_re adds, "they touch regularly on Sysadmin-like topics, definitely worth a listen…"
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."
Windows OS Hub is a blog loaded with posts on Microsoft tech as well as other topics of interest to Windows system administrators. This rather large knowledge base is searchable and sorted into categories, so you can find any explanation or tutorial in the collection that may help solve your latest tech challenge.
Helm is a tool for managing pre-configured "Charts" of Kubernetes resources. Provides an easy way to find and use popular software to run in Kubernetes or to share your own Kubernetes applications, create reproducible builds and intelligently manage manifest files. Our appreciation for the recommendation goes to yankdevil.
BGP4All Workshop is a free resource for those who wish to learn the intricacies of working with BGP routing. It's based on a discontinued program once offered by Cisco that was fortunately adopted by industry volunteers who keep it current for use in Network Operations Group workshops and at other global meetings.
Client Center for Configuration Manager is a ConfigMgr Agent troubleshooting tool that provides a user-friendly interface for a quick overview of client settings, running services and agent settings. vawlk uses it to "remotely troubleshoot SCCM client issues … This is just a gui for SCCM/Windows powershell commands, and it shows you a window for those commands as they run. Pretty sweet for an SCCM environment."
fping is similar to ping in that it sends ICMP echo probes to network hosts, but it is optimized for better performance when pinging multiple hosts. This useful tool has been around for ages and is considered a standard for network diagnostics and statistics. Suitable-repl describes it simply, "fping -g x.x.x.x/24 pings the subnet."
wavemon is a Linux wireless-network monitoring tool for watching signal and noise levels, packet statistics, device configuration and network parameters. The ncurses-based application is designed to work with all devices supported by the Linux kernel. Appreciation for the suggestion goes to sliddis.
Tera Term is an open-source tool that uses software to emulate different types of computer terminals, from DEC VT100 to DEC VT382. Supports telnet, SSH 1 & 2 and serial port connections plus has a built-in macro scripting language that supports Oniguruma regular expressions as well as a some nice plugins. Ron-Swanson-Mustache says, "I personally like TeraTerm more than Putty."