ReactOS (React Operating System) is an open source computer operating system intended to be binary compatible with application software and device drivers made for Microsoft Windows NT versions 5.x and up (Windows 2000 and its successors). A spin-off of a previous attempt to clone Windows 95, development started in early 1998, and has continued with the incremental addition of features already found in Windows.ReactOS is primarily written in C, with some elements, such as ReactOS Explorer, written in C++. The project is ported to the ARM and AMD64 processor architectures, and partially implements Windows API functionality. The latter is assisted by including parts from the Wine compatibility layer for Unix-like operating systems, but other functionality is implemented by the developers themselves. However, progress has been hampered by a lack of developers with the relevant skill-sets.
An extensive code audit is in place to protect against legal problems, such that implementation of the Windows API is only done by means of a complete clean room reverse engineering process. This has been in place following claims made in 2006 by a former developer and a third party in separate incidents that the project has either contained disassembled assembly code from Windows, or files directly originating from Microsoft. Both allegations have had no adverse legal consequences to the project, and development continues to this day.
ReactOS has been noted for its information on undocumented Windows APIs and more generally as an open-source drop-in replacement for Windows. The project aim, as cited from itself, is to allow users of Windows to completely renounce use of proprietary commercial software without having to switch to an operating system that is not binary-compatible with Windows, such as Linux. However, a lack of corporate backers and dedicated developers have limited its efforts to realize this.
The name ReactOS was coined by project founder Jason Filby, an Oracle developer from Durban, South Africa. While the term "OS" stood for Operating System, the term "react" referred to the group's dissatisfaction with - and reaction to - Microsoft's monopolistic position.
ReactOS is primarily written in C, with some elements, such as ReactOS Explorer, written in C++. The project relies on MinGW for compilation, and contributes to its development through the submission of patches to its components.
The developers aim to make the kernel more compatible with Windows NT version 5.2 (Windows Server 2003), the usermode APIs with Windows NT 6 (Windows Vista), and to add support for more applications and hardware. DirectX support is undertaken through ReactX, an in-house implementation. 2D hardware-accelerated rendering is done natively, while other drawing functionality is redirected to OpenGL as a stopgap solution.
Development is limited by a lack of people with relevant experience. As of 24 March 2010 (2010 -03-24)[update], in the ReactOS entry in Ohloh, the page followed through the "Very large, active development team" link lists 37 developers who have contributed over a 12-month period and a cumulative total of 97 present and former users who have contributed code to the project via Subversion since its inception. By contrast, there are 1000 or so developers who worked on Windows 7 alone, organized into 25 teams, with each team averaging 40 developers. In addition, in his presentation at Hackmeeting 2009 in Milan, ReactOS developer Michele C. noted that most of the developers learn about Windows architecture while working on ReactOS and have no prior knowledge.
 Abiword 2.6 running |  Ant Renamer 2.10 |  Ant Renamer 2.10 setup |
 Aquaria |  Aquaria |  Bomberman Jetters in BoycottAdvance GBA emu |
 Cave Story |  Cave Story |  DXDiag4 DDraw test |
 DXDiag4 display |  DXDiag4 files |  DXDiag4 |
 Flash in Firefox |  Flash in Firefox |  GLClock |
 MSN Messenger 4.6 |  MSN Messenger 4.7 |  MSN Messenger 5 |
 MSN Messenger 5 setup |  MSN Messenger 6 |  MSN Messenger 6.2 |
 MSN Messenger 6.2 setup |  MSN Messenger 6 setup |  MS Works 8.5 |
 MS Works 8.5 setup |  MS Works 8.5 setup |  Monster Truck Madness demo |
 Notepad++ |  RegSeeker 1.55 |  RegSeeker 1.55 |
 Shock4way3D Cube effect |  Shock4way3D Flip effect |  Shock4way3D Grid effect |
 Shock4way3D Inside effect |  Shock4way3D Wave cube effect |  Sonic 2 beta in Gens GS MegaDrive emu |
 Sonic 3 & Knuckles in Gens GS MegaDrive emu |  Sonic Advance 2 in BoycottAdvance GBA emu |  Starcraft demo |
 TortoiseSVN |  TortoiseSVN |  TuneUp 2009 installation |
 Theming via WineCFG |  XBMC |
ReactOS 0.3.4
 Visual Basic 5 |  Diablo 2 |  Jazz Jack Rabbit 2 Editor |
 OpenOffice 2 - Setup |  OpenOffice 2 - Setup |  OpenOffice 2 - Writer |
 OpenOffice 2 - Database |  OpenOffice 2 - Calc |  ReactOS Remote Desktop |
 ReactOS Remote Desktop |  ReactOS Remote Desktop |  ReactOS Remote Desktop |
ReactOS 0.3.3
 ReactOS Shell |  Mozilla Firefox |  Mozilla Thunderbird |
 ReactOS Shell |  ReactOS Control Panels |  Registry Editor |
 ReactOS bootscreen in QEMU and also ReactOS as host |  ReactOS in QEMU and also ReactOS as host |  "Mirror" - ReactOS in QEMU (Win32 host) viewing itself from within ReactOS |
 Quake III Arena |  Quake III Arena |  Quake III Arena |
 Screensaver |  Screensaver |  Wallpapers |
 Quake 2 |  Quake 2 |  Quake 2 |
 Unreal Tournament |  Unreal Tournament |  Unreal Tournament |
 Unreal Tournament |  Unreal Tournament |  Unreal Tournament |
 rDesktop |  Halo |  Installed Apps |
 WinAmp |  Enemy Territory |  Enemy Territory |
 ReactOS system control panel dialogs |  ReactOS Desktop |  Total Commander |
 ReactOS Explorer using the Mozilla ActiveX Control for Web Browsing |  IrfanView |  ReactOS Device Manager |
 WinRAR |  XnView |  Download! |
 Ad-Aware |  Zoom-In |  Resource Hacker |
 Xara3D |  Tux Paint |  Nero Burning Rom |
 7zip |  Alienblaster |  Blink Video - Duke Nukem Forever Trailer 2001 |
 ReactOS Setup - first stage (textmode) #1 |  ReactOS Setup - first stage (textmode) #2 |  ReactOS Setup - first stage (textmode) #3 |
 ReactOS Setup - second stage #1 |  ReactOS Setup - second stage #2 |  ReactOS Setup - second stage #3 |
ReactOS 0.3.1
 CPU-Z |  ReactOS Device Manager |  uTorrent |
ReactOS 0.3.0
 AbiWord, explorer, startmenu |  ReactOS Explorer |  Display settings |
 Firefox setup |  Firefox |  Firefox - rss dialog |
 Unreal Tournament |  Google Picasa |  command line FTP tool |
 ReactOS Service Manager |  system config tools |  7-zip |
 ReactOS startmenu |  ReactOS startmenu |  ReactOS startmenu - search |
 Flight Simulator (YSFlight) |  command line registry tool |  Opera 8.5 |
ReactOS 0.3.0 RC2
 startmenu & command line |  advanced startmenu functions |  system control panels & solitaire |
ReactOS 0.2.7, 0.2.8 and 0.2.9
 OpenOffice 1.1.4 |  Abi Word |  MS Office 2003 Setup |
 ReactOS Internet Browser |  Mozilla Firefox |  Mozilla SeaMonkey |
 K-Meleon |  Flash Player |  mIRC |
 Unreal Tournament |  Deus Ex |  OpenTTD |
 Adobe Photoshop 3 |  Paint Shop Pro 4 |  MS PowerPoint 7 |
 ReactOS Internet Browser |  Solitaire |  PhotoFiltre |
 Process Explorer |  MS Visual Basic 6 |  MS Visual Studio 2005 Setup |
 PuTTY |  ReactOS in QEmu in ReactOS |  XEmacs |
 DOSBox Shell |  DOSBox - DOOM |  Day of the Tentacle |
 7-zip |  WinRAR |  Microsoft Help Image Editor |
 IrfanView |  McAfee Stinger tool |  TuxPaint |
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