MatterControl - MatterControl is a free, open source app that lets you organize and manage your 3D prints.
Ring4 Meeting - Dead simple video conferencing - free, in browser
Slic3r - STL-to-GCODE translator for RepRap printers Here comes Slic3r! Its features are: - speed
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.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
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.