Skype — owned by Microsoft — is available for iOS, Android, Windows and Mac, and offers video and audio calling, as well as a messaging feature. It has an easy-to-use interface, and supports up to 50 people on the same audio call (the number of video callers depends on what device you’re using, according to the company). Skype also lets you record, save and share your video calls, and has live captions and subtitles.