Twilio
Cloud communications API platform for programmable SMS, voice calls, WhatsApp messaging, email and verification.
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Slack
Team messaging platform organized into channels, with direct messages, huddles, file sharing and thousands of integrations.
3CX
Full-featured PABX system, with call queues, built-in web conferencing, live chat and social media messaging all on one system.
Akkoma
Federated microblogging server with Mastodon, GNU social, and ActivityPub compatibility.
AnonAddy
Email forwarding service for creating aliases.
Answer
Knowledge-based community software. You can use it to quickly build your Q&A community for product technical support, customer support, user communication, and more.
AnyCable
Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.