ReactOS

Discover a free and open source operating system able to run your favorite application and drivers compatible with Windows.

[ReactOS @reactos]

#ReactOS calls you, for the road to Beta!

[ReactOS @reactos]

Experiments for #ReactOS ARM64 are ongoing! ;)

[SidiHmeed @sidihmeed]

I introduce ROR: ReactOS on RaspberryPI5

It draws correctly now on win32k but on the other hand, has a mountain of work left
https://t.co/U3hWcj3rnH

[ReactOS @reactos]

#ReactOS works with this CMD 649 ATA-100 controller :)

[ReactOS @reactos]

#ReactOS joins VCF Southwest for the first time!

Read the blogpost by our developer @cbialorucki1 here, and feel free to share!
https://t.co/ICRNKnlkZ1

[ReactOS @reactos]

Unreal Tournament 2004 works on #ReactOS as well! Again on real hardware!

Watch the test by @AotoriHibiki:
https://t.co/wuY2pcJ55c

[ReactOS @reactos]

The regression has been identified. We hope to see #ReactOS soon running on that PC again ^^

[Timothy Gaskell @tngaskell]

Pleasantly surprised to discover late-2023 @reactos runs even on a 166MHz Pentium with no MMX and only 64MB RAM. Too little RAM to unpack installers, however, and more recent builds won't even load freeldr stage 2 on this hardware.

[ReactOS @reactos]

Necrovision runs on #ReactOS, tested on real hardware!

Again by @AotoriHibiki.

https://t.co/Fg6OS7LtOj

[ReactOS @reactos]

Here's Freeciv running on #ReactOS!

[ReactOS @reactos]

@RealAMcKeever As #ReactOS development progresses, we hope to see improved graphics performance with less bugs.

[ReactOS @reactos]

We are pleased to see #ReactOS working on this Toshiba V3100, with Intel GMA i810 graphics drivers! ^^

[Alex McKeever - アレックスマッキーバー @RealAMcKeever]

Never thought I’d see @reactos running this well on a late 90s Toshiba desktop with all the proper drivers being installed.

Yes that’s vintage Intel GMA graphics (i810) working too.

[ReactOS @reactos]

Here's Unreal Tournament working with #ReactOS, tested on real hardware!!

Watch the test by @AotoriHibiki here:
https://t.co/cr78HjJib1

[ReactOS @reactos]

And this is #ReactOS ARM64 running on Raspberry Pi 5!

Back in 2022-23, our ARM64 port was only able to produce user-mode executables. While being in a experimental state, we could finally see ARM64 in action!!

[Stas'M @x86corez]

@Max_RM_ @__alula @reactos Well it actually does, not natively on Apple yet.
This is on Raspberry Pi 5, pics from ReactOS Discord.

[ReactOS @reactos]

Detailed instructions about how to build #ReactOS ARM64 port will be provided by @sidihmeed.

[ReactOS @reactos]

For 8 months, our contributor @sidihmeed has been working on getting #ReactOS ARM64 port to boot. Here's the first success!

Being still in an experimental state, you may want to try it.

[Alula @__alula]

So @ReactOS is now running natively on ARM64, courtesy of Ahmed Arif

https://t.co/kglimtn5VV

[ReactOS @reactos]

The build requires UEFI compatible ARM64 with GICv2 or v3 enabled and will support boards starting from ARMv8-A and upward, with the special case of RPI5 that have his own interupt chip.

[ReactOS @reactos]

@zukrmn No need to write a book on it. Simply put, #ReactOS is developed by a handful of developers and contributors who have deep knowledge of NT internals.
On the other hand, Windows is a product backed by thousands of paid developers working for a multi-billion-dollar company.

[ReactOS @reactos]

#ReactOS installs and runs on HP 635!

[ReactOS @reactos]

3DMark'03 runs in #ReactOS, tested on real hardware!

https://t.co/wrCNFbitw5

[ReactOS @reactos]

Hatoful Boyfriend works in #ReactOS, tested on real hardware!

Watch it here, by @AotoriHibiki:
https://t.co/DVGKodYICA

[ReactOS @reactos]

Sorry for typo. It would be "0.4.15 and upcoming 0.4.16".

[ReactOS @reactos]

#ReactOS 0.4.14 and upcoming 0.4.16 have already taken many steps towards Beta.

Your contributions greatly speed up the progress.

[Ayaan 🐧 @twtayaan]

A group of developers tried rebuilding Windows from scratch.

Without Microsoft’s code. 🤯

They called it ReactOS. 🖥️

> Started in 1996 as FreeWin95.
> Goal: make Windows free and open source.
> Developers argued for years about the design.
> Barely wrote any actual code.
> Scrapped everything and restarted in 1998.
> Renamed the project ReactOS.
> Built as a reaction to Microsoft’s monopoly.
> Designed to look like Windows XP.
> Start menu. Taskbar. File Explorer.
> Almost identical to real Windows.
> But the real goal was much crazier.
> Binary compatibility.
> Meaning real Windows .exe files should just run.
> No emulators. No virtual machines.
> Firefox worked. LibreOffice worked. Adobe Reader worked.
> But there was one huge problem.
> They couldn’t legally copy Microsoft’s code.
> One developer studied Windows behavior.
> Another developer rewrote it from scratch.
> A process called clean-room engineering.
> Extremely slow. Extremely difficult.
> Nearly 30 years later…
> 300 contributors.
> 15 million lines of code.
> ReactOS is still in alpha today.

Most open-source projects replace apps.

ReactOS tried replacing Windows itself. 🔥