Online Communication Services
Email Services
GMX Mail , FastMail , Hushmail , Gmail , Mail.com , Yahoo! Mail
Instant Messaging Services
BlackBerry Messenger , Slack , iMessage , Telegram Messenger , Facebook Messenger , WhatsApp , Pidgin
Video Telephony and Chat Services
Skype , appear.in , FaceTime , Google Hangouts , Tox , AnyMeeting