GUI Tools for OpenConnect
NetworkManager
Support for OpenConnect in NetworkManager has been integrated into GNOME git and is released alongside NetworkManager's other VPN modules: https://download.gnome.org/sources/NetworkManager-openconnect/.
OpenConnect is also supported in KDE Plasma NM as well as the older widget-based NetworkManagement applet.
ConnMan
ConnMan has core OpenConnect functionality as from version 0.48. ConnMan UI front ends may lack VPN support.
OpenConnect-gui
OpenConnect-gui is a graphical (Windows and MacOSX) port of OpenConnect.