Brynhildr is described as 'It allows you to connect to any remote computer by specifying the IP address and the port number. Includes both server and client tools and supports screen transfer, voice transmission, encrypted communication, clipboard sharing (text), file transfer and multi-monitor support' and is an app in the Network & Admin category. There are more than 10 alternatives to Brynhildr for a variety of platforms, including Windows, Linux, Mac, Android and BSD. The best alternative is TeamViewer. It's not free, so if you're looking for a free alternative, you could try Remmina or DWService. Other great apps like Brynhildr are AnyDesk (Free Personal), UltraVNC (Free, Open Source), TightVNC (Free, Open Source) and NoMachine (Freemium).
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.
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.
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.