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PersonCenteredTech, a renown training company for teletherapy practice and ethics, has added a bunch of emergency trainings for therapists taking their practice virtual in the pandemic:
Doxy.me - Free HIPAA compliant platform for telehealth. Yes, they'll give you a HIPAA BAA with the free level. Pro level has additional optional features and is cheap. Extremely easy to use for both clinician and client. (Vanessa's recommendation: if you don't know what you're doing, just do this, it's free and fast to set up.)
VSee
Zoom - only HIPAA compliant with the $200/mo HIPAA version, apparently no waiting room feature. Awesome backward compatibility, if you have clients with super-old computers.