tcpdump
Tcpdump is a powerful command-line packet analyzer that allows users to display the contents of network packets transmitted or received over a network to which the computer is attached. It operates on most Unix-like systems, including Linux, Solaris, FreeBSD, NetBSD, OpenBSD, and macOS, utilizing the libpcap library for network traffic capture. Tcpdump can read packets from a network interface card or from a previously created saved packet file, and it provides options to write packets to standard output or a file. Users can apply BPF-based filters to limit the number of packets processed, enhancing usability on networks with high traffic volumes. The tool is distributed under the BSD license, making it free software. In many operating systems tcpdump is available as a native package or port, which simplifies installation of updates and long-term maintenance.
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NetBSD
NetBSD is a free, fast, secure, and highly portable Unix-like Open Source operating system. It is available for a wide range of platforms, from large-scale servers and powerful desktop systems to handheld and embedded devices. NetBSD was originally released in 1993. Over time, its code has found its way into many surprising environments, on the basis of a long history of quality, cleanliness, and stability. The NetBSD code was originally derived from 4.4BSD Lite2 from the University of California, Berkeley. NetBSD is an entirely free and open-source UNIX-like operating system developed by an international community. It isn't a "distribution" or variant but has evolved over several decades to be a complete and unique operating system in the BSD family. NetBSD users enjoy a simple, well-documented, and fully integrated UNIX-like system that feels minimal, and in many ways traditional, while including many modern and interesting features, and support for recent hardware.
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Rudix
Rudix is a build system target on macOS (formerly known as Mac OS X) with minor support to OpenBSD, FreeBSD, NetBSD, and Linux. The build system (also called "ports") provides step-by-step instructions for building third-party software, entirely from source code. Rudix provides more than a pure ports framework, it comes with packages, and precompiled software bundled up in a nice format (files *.pkg) for easy installation on your Mac. If you want to collaborate on the project, visit us at GitHub/rudix-mac or at our mirror at GitLab/rudix. Use the GitHub issue tracker to submit bugs or request features. Similar projects or alternatives to Rudix are Fink, MacPorts, pkgsrc, and Homebrew. Packages are compiled and tested on macOS Big Sur (Version 11, Intel only!), Catalina (Version 10.15) and OS X El Capitan (Version 10.11). Every package is self-contained and has everything it needs to work. The binaries, libraries, and documentation will be installed under /usr/local/.
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Fink
The Fink project wants to bring the full world of Unix open source software to Darwin and Mac OS X. We modify Unix software so that it compiles and runs on Mac OS X ("port" it) and make it available for download as a coherent distribution. Fink uses Debian tools like dpkg and apt-get to provide powerful binary package management. You can choose whether you want to download precompiled binary packages or build everything from source. The project offers precompiled binary packages as well as a fully automated build-from-source system. Mac OS X includes only a basic set of command-line tools. Fink brings you enhancements for these tools as well as a selection of graphical applications developed for Linux and other Unix variants. With Fink the compile process is fully automated; you'll never have to worry about Makefiles or configure scripts and their parameters again. The dependency system automatically takes care that all required libraries are present.
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