The best open source alternative to UltraVNC is RustDesk. If that doesn't suit you, our users have ranked more than 100 alternatives to UltraVNC and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to UltraVNC are Remmina, TightVNC, Bananas Screen Sharing and TigerVNC.
Provides secure, cross-platform remote access and file sharing with no registration needed. Offers end-to-end encryption, self-hosting, multi-monitor support, screen sharing, and portable use, all with a lightweight, ad-free interface.
Open source remote desktop client for Linux and BSD supporting RDP, VNC, SPICE, and more, aimed at sysadmins and travelers needing remote access with features like scrollable high-res desktops and organized connection management.
TightVNC is a free remote desktop application. With TightVNC, you can see the desktop of a remote machine and control it with your local mouse and keyboard, just like you would do it sitting in the front of that computer.
Bananas offers a cross-platform, peer-to-peer screen-sharing service without needing an account or server infrastructure. It uses WebRTC for secure connections, lets users collaborate with multiple cursors, and features a unique connection URL. Privacy is ensured as no data is stored.
TigerVNC is an advanced VNC implementation. It is based on the fourth generation of VNC. TigerVNC also includes features from the TightVNC and TurboVNC projects. This includes accelerated JPEG compression. TigerVNC supports the latest X.Org X server.
HopToDesk is a Remote Desktop Software that focuses on privacy and security. Allowing users to connect and control any device from anywhere. HopToDesk with its frictionless application is perfect for enterprises with work-from-home employees or the personal user who wants to...
Guacamole is a clientless remote desktop gateway. It supports standard protocols like VNC and RDP. We call it clientless because no plugins or client software are required.
Remotely is a free and open-source remote desktop, remote scripting, and rich auto-complete to maximize your IT support efficiency.
FreeRDP is a free implementation of the Remote Desktop Protocol (RDP), released under the Apache license. Enjoy the freedom of using your software wherever you want, the way you want it, in a world where interoperability can finally liberate your computing experience.
AFK connects your iPhone or Android to your Mac via WebRTC. Built for developers using AI coding agents (Claude Code, Cursor, Codex) who want to check in from the couch, give feedback, and kick off tasks without being stuck at their desk.
A VNC/SSH Client for the GNOME Desktop
xrdp provides a graphical login to remote machines using Microsoft Remote Desktop Protocol (RDP). xrdp accepts connections from a variety of RDP clients:
Singapore
Italy
EU
Russia
United Arab Emirates
United States
Using as server: After connecting, don't have to wait on black screen for 5 seconds until remote screen appears. Very responsive.