When we talk about free operating systems, most people immediately think of Linux, but there's a very close and fascinating cousin: BSD systems . These distributions are direct descendants of UNIX, the legendary system that laid the foundations of modern computing, and although they have a modest market share today, their influence is colossal, being present in devices we use daily without even realizing it.
Delving into the world of BSD is like taking a journey to the roots of computing. They are not simply Linux clones, but a family with its own philosophy , born in the halls of the University of California, Berkeley. Unlike other projects, BSD focuses on system cohesion and a license freedom that has allowed even proprietary software giants to leverage its code.
The origin of it all: From Bell Labs to Berkeley
It all started in the 70s, when AT&T's Bell Labs created UNIX. At that time, AT&T couldn't sell the software due to antitrust issues, so they licensed the source code to universities. That's how the University of Berkeley got its hands on the system and began modifying it to adapt it for their research.
A student named Bill Joy was key to this process, creating tools that are now legendary, such as the vi text editor and the C shell. What began as a series of plugins for Unix (the famous Berkeley Software Distribution) eventually became a complete and self-contained operating system. However, the relationship with AT&T soured when the latter decided to withdraw its usage licenses for commercial reasons, triggering a legal battle that forced Berkeley to remove all proprietary traces from its code.
This debugging process resulted in free and highly permissive versions. BSD not only contributed the code, but also groundbreaking technical innovations that we now take for granted, such as the TCP/IP protocol suite , paged virtual memory management, and the Fast FileSystem. Essentially, much of today's internet infrastructure bears the BSD stamp.
How does BSD differ from GNU/Linux?
At first glance, if you open a FreeBSD terminal and a Debian terminal, you'll feel right at home in both. But under the hood, things change. The biggest difference lies in the development model . In Linux, the kernel is one thing and the rest of the system (GNU tools) is another; distributions are like a collage of pieces from different places. In BSD, the kernel and core utilities are developed as a single, cohesive unit.
Then there's the issue of licensing. While Linux uses the GPL, which requires releasing the code of any derivative, the BSD license is much more flexible . It allows a company to take the code, modify it, and close it down to sell it as proprietary software. That's why BSD code is embedded in macOS, iOS, and Windows (especially in its networking stack), and even in consoles like the PlayStation 4 and the Nintendo Switch.
For day-to-day use, BSD employs a system called ports to install third-party applications. While the base system remains stable and is updated according to a schedule, user applications can be kept up-to-date, preventing a kernel bug from crashing the entire system.
The most prominent distributions and their uses
If you want to take the plunge, there are several options depending on what you need the hardware for. FreeBSD is probably the star of the bunch. It's focused on high performance and ease of use, making it a favorite for web content servers, storage, and security. It's the foundation for many other projects and feels very robust on both x86 and ARM architectures.
If you're paranoid about security, OpenBSD is for you. This project originated as a fork of NetBSD, led by Theo de Raadt, with an obsession with making the code secure by default . Every line of code is meticulously reviewed, and all unnecessary services are disabled to reduce the attack surface, making it ideal for firewalls and routers.
On the other hand, we have NetBSD , the queen of portability. Its slogan, "of course it runs NetBSD," is no joke; it works on almost anything, from old computers to NASA space missions . If you have old or very unusual hardware, NetBSD is the safest bet.
- DragonFly BSD: A fork of FreeBSD that focused on rewriting concurrency management and the HAMMER file system to improve server computing.
- GhostBSD: Designed for the user coming from Windows or Linux who wants something ready to use, with a pre-installed graphical environment (MATE) and easier to configure.
- NomadBSD: A gem to carry on a USB drive. It allows you to run a persistent BSD system for repair equipment or test software without touching the hard drive.
- MidnightBSD: Desktop-oriented, it mixes code from various branches and offers a very familiar Xfce environment.
Other interesting projects and derivatives
The BSD family tree is enormous. There are highly specialized tools like pfSense and OPNsense , which are essentially FreeBSD transformed into powerful firewalls and routers. There are also projects like TrueNAS (formerly FreeNAS) for managing mass storage using the ZFS file system.
There are even attempts to take the desktop experience to another level, such as helloSystem , which aims for the simplicity and elegance of macOS, or ravynOS . We can't forget that the kernel of Apple's Macs, called Darwin , is a direct descendant of NeXTSTEP and, therefore, of BSD.
For the more experienced, there are distributions like HardenedBSD , which adds extra layers of mitigation against exploits, or the curious case of Void Linux , which although it is Linux, was created by a NetBSD developer and inherits many of its ideas, such as the XBPS package system and the use of runit.
Running a BSD system today is a rewarding experience for those seeking stability and a well-structured system, even if hardware support is a bit more challenging than with Linux. Despite holding less than 0,5% of the market share on personal computers, its technical legacy forms the backbone of much of the technology that underpins today's digital world.