FluffyChat - Open. Nonprofit. Cute ?
Mailshake - Mailshake lets you build your professional network through a smart and intuitive approach to cold emailing.
TeleGuard - TeleGuard is a secure messenger that makes it store that your data or chats are not stored while collaborating or communicating with partners and friends.
Instantly - Build your own infinitely scalable cold email outreach system with Instantly.
Molly (Signal fork) - Molly is an independent Signal fork for Android
Snov.io - Sales engagement on autopilot.