Microsoft Teams brings together chat, video calls, and file sharing, integrated with Microsoft 365. Free version available, paid plans from $4/user/month.
Trello is Atlassian's Kanban-board task management tool, simple and visual, ideal for organizing projects. Free plan, paid tiers from $5/month per user.
KrispCall is a cloud phone system for sales and support teams, offering virtual numbers in many countries worldwide. Plans start at $12 per user per month.