From room-sized machines humming away in research labs to tiny boards powering school projects, computers have reshaped almost every part of modern life. Along the way, a handful of systems have stood out as true milestones, setting new standards for power, usability and sheer imagination.
The ten machines below did far more than crunch numbers. They shifted expectations, opened up entirely new industries and helped define what “computing” means for everyone, not just scientists in white coats.
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1. ENIAC (1945) – The Dawn of Electronic Computing
The Electronic Numerical Integrator and Computer, better known as ENIAC, is often credited as the first large-scale, general-purpose electronic computer. Built for the United States Army during the Second World War, it filled a room, consumed enormous amounts of power and relied on thousands of vacuum tubes.
ENIAC could perform complex ballistic and scientific calculations far faster than human “computers” working with slide rules. It proved that fully electronic computation was not just possible but practical, and it laid the groundwork for the commercial and scientific machines that followed.
Today, institutions such as the Smithsonian National Museum of American History preserve and document the story of ENIAC and its successors for future generations.
2. UNIVAC I (1951) – When Computers Hit the Headlines
The UNIVAC I (Universal Automatic Computer) was the first commercially produced computer in the United States. Where ENIAC was essentially a one-off project, UNIVAC I was designed as a product that governments and large organisations could purchase and install.
Its most famous moment came in 1952, when a UNIVAC system correctly predicted the result of the US presidential election live on television, even though early vote counts suggested otherwise. That prediction stunned viewers and firmly planted the idea that computers could handle serious, high-profile data work.
UNIVAC I helped move computing from the obscure world of defence contracts into mainstream business and public awareness.
3. IBM System/360 (1964) – A Family That Redefined Compatibility
Before the IBM System/360, buying a new computer often meant rewriting all of your software from scratch. IBM changed that by introducing a whole family of machines with a shared architecture and instruction set.
This concept of a compatible range of systems enabled businesses to upgrade hardware without forfeiting their software investment. It also fostered a thriving ecosystem of applications that could run on various System/360 models, ranging from smaller installations to powerful mainframes.
The idea of a standard platform that spans multiple generations remains central to modern computing, from desktop processors to entire cloud environments.
4. Xerox Alto (1973) – The GUI That Inspired the Future
The Xerox Alto never became a mass market product, but its influence is enormous. Developed at Xerox PARC in the early 1970s, the Alto featured a bitmapped screen, windows, icons and a pointing device that would later become the standard computer mouse.
Researchers at PARC demonstrated how people could interact with information visually rather than via purely text-based commands. Concepts such as overlapping windows, WYSIWYG editing and desktop style metaphors all appeared here long before they reached the mainstream.
The Computer History Museum holds several Alto systems and documents how this research system inspired companies like Apple and Microsoft to create their own graphical interfaces.
5. Cray-1 (1976) – Supercomputing Power For Serious Science
The Cray-1 looked like something from science fiction, with its distinctive C-shaped cabinet and built-in padded “bench” around the base. More importantly, it was one of the first commercially successful supercomputers, designed by legendary engineer Seymour Cray.
With vector processing and blistering performance for its time, the Cray-1 enabled more accurate weather forecasts, complex simulations and advanced research in physics and engineering. Governments and research laboratories around the world queued up to buy this new computational powerhouse.
The Cray-1 showed how raw computing performance could unlock scientific discoveries that would be impossible with conventional machines.
6. Apple II (1977) – Home Computing For Ordinary People
The Apple II was not the very first personal computer, but it was one of the first that ordinary families and schools could realistically own and use. With its plastic case, built-in keyboard and ability to connect to a television, it felt far less intimidating than earlier hobbyist kits.
Popular software such as the VisiCalc spreadsheet transformed the Apple II from a fun gadget into a serious business tool. At the same time, countless youngsters learned to program in BASIC on Apple II machines in classrooms and bedrooms, sparking tech careers that would shape the industry.
Its combination of relative affordability, flexibility and a growing software library helped cement the idea of a “computer in the home”.
7. IBM PC 5150 (1981) – The Standard That Would Not Die
When IBM launched the PC 5150, it created a platform that would echo through decades of desktop computing. Built from off-the-shelf components and documented in a way that allowed other manufacturers to create compatible systems, the IBM PC quickly became the template that others copied.
The rise of “PC clones” drove prices down and availability up, making personal computers far more accessible to businesses and individuals. Software developers targeted the PC platform, which in turn made it even more attractive to customers.
Even today, much of the desktop and laptop world still follows architectural ideas that began with the original IBM PC.
8. Apple Macintosh (1984) – Friendly Computing For The Masses
Launched with a now legendary advert, the original Macintosh brought graphical user interfaces, icons and a mouse to a much wider audience. Unlike the expensive Xerox Alto, the Macintosh was intended as a product for creatives, students and everyday office workers.
Its emphasis on fonts, on-screen graphics and user friendliness broke away from the command-line world that dominated at the time. Features that are now taken for granted, such as drag and drop, pull-down menus and a focus on design, were central to the Mac experience.
The Macintosh shifted expectations about how approachable and visually polished a computer should be, especially for non-technical users.
9. NeXT Computer (1988) – Where The Web Was Born
After leaving Apple, Steve Jobs founded NeXT and produced the NeXT Computer, a stylish black workstation with a powerful operating system called NeXTSTEP. Although it never sold in huge numbers, this machine had an outsized impact on the future of software.
In 1989 and 1990, Tim Berners-Lee used a NeXT machine at CERN to build the first web server and web browser, effectively creating the World Wide Web. The object-oriented ideas and development tools in NeXTSTEP also influenced later software design.
When Apple acquired NeXT in the mid-1990s, NeXTSTEP evolved into the foundations of macOS, iOS and other Apple operating systems that millions of people use today.
10. Raspberry Pi (2012) – Computing Back Into The Classroom
The Raspberry Pi began as an attempt to rekindle interest in computer science among students. The idea was simple: create a very low-cost, credit-card-sized computer that pupils could afford to tinker with at home or in school.
The result was far more successful than anyone expected. Raspberry Pi boards now sit inside robots, media centres, retro gaming consoles and industrial control systems, as well as on millions of desks in classrooms and workshops.
By stripping a computer back to its essentials and making it affordable, the Raspberry Pi Foundation helped a new generation learn to code, solder and experiment with hardware, echoing the spirit of early home computers for the 21st century.
From hulking mainframes to tiny boards tucked behind a television, each of these milestone computers pushed the boundaries of what machines could do and who could use them. They did not simply make existing tasks faster. They enabled brand new kinds of science, business, creativity and play, and they changed expectations about how people interact with technology.
Although the devices on this list span many decades, they are all part of the same story: the ongoing march from rare, specialised machines to an always-connected digital world that fits in a pocket.
Which of these historic computers do you think had the greatest impact on the way we live and work today?
Have we missed a machine that you feel absolutely deserves a place among the greats?
Share your thoughts in the comments, and feel free to reminisce about the first computer you ever used.
When you are ready for another trip through tech history, explore more fun and fascinating countdowns here on The Very Best Top 10 and keep your inner gadget geek very much alive.