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Remote Administration Tool for Windows
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Free, Open-Source Remote Administration Tool for Windows

Quasar is a fast and light-weight remote administration tool coded in C#. The usage ranges from user support through day-to-day administrative work to employee monitoring. Providing high stability and an easy-to-use user interface, Quasar is the perfect remote administration solution for you.


  • TCP network stream (IPv4 & IPv6 support)
  • Fast network serialization (Protocol Buffers)
  • Compressed (QuickLZ) & Encrypted (TLS) communication
  • Multi-Threaded
  • UPnP Support
  • Support
  • Visit Website (hidden & visible)
  • Show Messagebox
  • Task Manager
  • File Manager
  • Startup Manager
  • Remote Desktop
  • Remote Shell
  • Download & Execute
  • Upload & Execute
  • System Information
  • Computer Commands (Restart, Shutdown, Standby)
  • Keylogger (Unicode Support)
  • Reverse Proxy (SOCKS5)
  • Password Recovery (Common Browsers and FTP Clients)
  • Registry Editor

Supported runtimes and operating systems

  • .NET Framework 4.0 Client Profile or higher (Download)
  • Supported operating systems (32- and 64-bit)
    • Windows XP SP3
    • Windows Server 2003
    • Windows Vista
    • Windows Server 2008
    • Windows 7
    • Windows Server 2012
    • Windows 8/8.1
    • Windows 10


Open the project in Visual Studio 2017+ and restore the NuGET packages. Once all packages are installed the project can be compiled as usual by clicking Build on the top or by pressing F6. See below which build configuration to choose from.

Building a client

Build configuration Usage scenario Description
Debug configuration Testing The pre-defined Settings.cs will be used, so edit this file before compiling the client. You can execute the client directly with the specified settings.
Release configuration Live use Start Quasar.exe and use the client builder.






Quasar is distributed under the MIT License.
Third-party licenses are located here.

Thank you!

I really appreciate all kinds of feedback and contributions. Thanks for using and supporting Quasar!

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