Ring4 Meeting - Dead simple video conferencing - free, in browser
SwitchResX - SwitchResX is a tool designed to manage resolutions of all your monitors and HDTVs.
Stork.ai - AI-Based Collaboration for Hybrid Teams. Rich media messaging, advanced video and voice conferencing, auto-transcribing and screen sharing. Serendipitous meetings at the water-cooler with your human and AI teammates.
EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.
Resolutionator - Resolutionator makes it simple to use any of your display's available resolutions.