Cal Video is the in-house web-based video conferencing platform powered by Daily.co, which is minimalistic and lightweight, but has most of the features you need.
Google Calendar is a time management and scheduling service developed by Google. Allows users to create and edit events, with options available for type and time. Available to anyone that has a Gmail account on both mobile and web versions.

Google Meet is Google's web-based video conferencing platform, designed to compete with major conferencing platforms.
HubSpot is a cloud-based CRM designed to help align sales and marketing teams, foster sales enablement, boost ROI and optimize your inbound marketing strategy to generate more, qualified leads.
Microsoft Teams is a business communication platform and collaborative workspace included in Microsoft 365. It offers workspace chat and video conferencing, file storage, and application integration. Both web versions and desktop/mobile applications are available. NOTE: MUST HAVE A WORK / SCHOOL ACCOUNT
Microsoft Office 365 is a suite of apps that helps you stay connected with others and get things done. It includes but is not limited to Microsoft Word, PowerPoint, Excel, Teams, OneNote and OneDrive. Office 365 allows you to work remotely with others on a team and collaborate in an online environment. Both web versions and desktop/mobile applications are available.
Salesforce (Sales Cloud) is a cloud-based application designed to help your salespeople sell smarter and faster by centralizing customer information, logging their interactions with your company, and automating many of the tasks salespeople do every day.
Zoom is a secure and reliable video platform that supports all of your online communication needs. It can provide everything from one on one meetings, chat, phone, webinars, and large-scale online events. Available with both desktop, web, and mobile versions.