These are some of the tools I find work really well whilst working from home - they are often free at entry level and really do the job.
this offers a free calendar management tool to book appointments and meetings without double booking yourself. It has integrations with Google Calendar, Office 365, Outlook and iCloud. It automates event notifications and ensures everyone stays in sync using email notifications.
a great tool you can use to hold remote meetings, video conferencing and screen sharing. It is easy to set up and to manage, you will be up and running in no time. They offer a free version with some limitations.
to share and make quick simple videos - really helps to sort out client questions where a visual is easier to make rather than write a complicated response.