noVNC is described as '- VNC client using HTML5 (Web Sockets, Canvas) with encryption (wss://) support' and is an app in the Network & Admin category. There are seven alternatives to noVNC for a variety of platforms, including Linux, Android, Windows, Mac and Raspberry Pi. The best alternative is TeamViewer. It's not free, so if you're looking for a free alternative, you could try Remmina or UltraVNC. Other great apps like noVNC are VNC Connect (Freemium), Apache Guacamole (Free, Open Source), Xrdp (Free, Open Source) and AVNC (Free, Open Source).
Remmina is a remote desktop client written in GTK+. Remmina primarily targets system administrators and travelers that need to work with computers remotely in front of either large monitors or tiny netbooks.
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.
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.
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).