Corecon - Corecon offers integrated estimating, project management, and job costing for small to medium-sized construction companies.
Ring4 Meeting - Dead simple video conferencing - free, in browser
Building Connected - BuildingConnected is a bid management solution for the construction industries.
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.
BuilderTREND - Buildertrend is the #1 construction management software and construction app for home builders, remodelers, specialty contractors and commercial construction.
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.