Threema - Secure and Private Messenger#webtool#mobile#open-source#chat#messaging#messenger#alternative#whatsapp#gratuitThreema - Secure and Private Messenger
ManyChat – The easiest way to create Facebook Messenger bot#webtool#automation#marketing#bot#chat#freemium#messaging#instagram#facebook#whatsappManyChat – The easiest way to create Facebook Messenger bot