The best free alternative to GoToAssist is DWService, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to GoToAssist and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to GoToAssist are UltraVNC (Free, Open Source), mRemoteNG (Free, Open Source), TightVNC (Free, Open Source) and NoMachine (Freemium).
xrdp provides a graphical login to remote machines using RDP (Microsoft Remote Desktop Protocol). xrdp accepts connections from variety of RDP clients: FreeRDP, rdesktop, NeutrinoRDP and Microsoft Remote Desktop Client (for Windows, macOS, iOS and Android).
Remote Utilities is a remote PC access program for connecting to a remote PC over LAN or via the Internet. The program is used by system administrators, home users and helpdesks for remotely managing PCs in their corporate or home network, or providing customer support.
Dayon! is a user friendly, open-source, cross-platform solution, that allows controlling of remote computers. It can be used as free alternative to various commercial remote desktop and remote assistance products.
Aeroadmin - zero configuration and easy to use remote desktop software. Ready to use right after downloading. Remote control available within 30 seconds! Aeroadmin works behind NAT and connects computers in different LAN, firewall friendly.
LiteManager - fast and secure software for remote administration of Windows-based computers. Remote support, remote access to home and office, remote desktop connection, file transferring, text chat, multi monitor support. Android, OSX and iOS clients.
SaaS Remote management: remote desktop, shell, process and file transfer. It has an small-sized agent which is run as a service. These agents connect to our servers so that you can connect to them from anywhere just with a browser. No firewalls/NAT.
The best open source remote desktop software. It is an alternative of TeamViewer and AnyDesk, but open source. You have full control of your data, no concern of security. You can use my rendezvous/relay server, or set up your own, or write your own rendezvous/relay server.