GoToAssist is described as 'Provides you with live-support capability. Easily view and control your customers computers online to quickly resolve their technical issues' and is an app in the Network & Admin category. There are more than 50 alternatives to GoToAssist for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android. The best alternative is TeamViewer. It's not free, so if you're looking for a free alternative, you could try DWService or UltraVNC. Other great apps like GoToAssist are AnyDesk (Paid), mRemoteNG (Free, Open Source), TightVNC (Free, Open Source) and NoMachine (Freemium).
DWService is an open source project which offers a service that allows access to remote systems (Windows, Mac, Linux, Raspberry...) using a standard web browser - without any component required on the client side.
UltraVNC is easy to use and free software that can display the screen of another computer (via the Internet or a local network) on your own screen. The program allows you to use your mouse and keyboard to control the other computer remotely.
TightVNC is a free remote control software package. 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.
VNC is remote access and control software which allows you to view and fully interact with one computer desktop (the "VNC Connect") using a simple program (the "VNC viewer") on another computer desktop or mobile device anywhere on the Internet.
Support customers on a remote computer easily through web-based, on-demand remote support sessions. Set up unattended remote access and manage remote PCs, laptops, mobile devices, and servers effortlessly.
LogMeIn gives you fast, easy remote access to your PC or Mac from your browser, desktop and mobile devices. Premium features like file transfer, file sharing and remote printing help you stay connected and productive wherever you go.