Messaging

Converse is a free and open-source web-based XMPP chat client.

Databag is a fast, lightweight, and secure self-hosted federated messenger.

Element is a secure and interoperable messaging app that prioritizes user data control and privacy.

GatewayAPI is a reliable and scalable global SMS gateway with a comprehensive API and numerous integrations for businesses of all sizes.

ginlo Private is a secure, fully encrypted messaging app for private communication, offering advanced features and complete privacy.

Gotify is a simple, self-hosted, open-source server for sending and receiving messages.

Eclipse Mosquitto is a lightweight, open-source MQTT broker ideal for IoT applications.

OpenTouch Message Center (OTMC) was a unified messaging application providing voicemail, fax, and email management, but is now discontinued.

seven is a reliable and easy-to-use business messaging gateway offering SMS sending and receiving solutions via API, web app, email, and direct app integration.

SimpleX Chat is a privacy-focused, decentralized messenger that protects user identities and metadata by eliminating user IDs.

SKRED is the ultimate anonymous and secure communication app for private voice and video calls, messaging, and media sharing.

SMS.to is a versatile platform offering bulk SMS, SMS marketing, and SMS API services for enhanced customer communication.

Smstools offers a reliable and easy-to-integrate SMS gateway API for sending and receiving SMS messages worldwide, with features like webhooks and integrations with popular services.

Snikket is a privacy-focused, self-hostable messaging platform that gives users complete control over their data and communications.

Threema is a secure and private messaging app prioritizing user data protection and end-to-end encryption.

Threema Broadcast is a secure web application for efficient one-to-many communication via instant messaging, offering features like messenger newsletters, chatbots, and centrally managed groups.

Threema Gateway enables secure and versatile messaging integration with your software, offering a superior alternative to SMS.

Threema Work is a secure and compliant business messenger that enhances team communication and boosts productivity while ensuring data privacy and compliance with regulations.

Threema Education offers a secure, private, and affordable instant messaging solution for schools and universities, facilitating efficient communication while protecting student and teacher data.

Threema OnPrem is a self-hosted, highly secure enterprise messaging solution providing total data ownership and control.

YateSMSC is a feature-rich, cost-effective Short Message Service Center (SMSC) for GSM, UMTS, and LTE networks, offering flexible configuration and robust management via a JSON API and web interface.