Ring4 Meeting - Dead simple video conferencing - free, in browser
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
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.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
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.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.