Meetingbird - Powerful meeting scheduling and notes — right in your calendar
TextBlast Bulk SMS - Send personalized mass messages easily
Standuply - Run daily standup meetings and track your metrics in Slack
LoopMessage - LoopMessage is a perfect macOS tool for personalized mass messaging via iMessage/SMS, WhatsApp, Facebook Messenger, Telegram, Viber, and Skype.
Navigator - The Teamwork assistant — run great meetings without busywork
WhatsMany - Send personalised WhatsApp messages in bulk